Solved Protons. Neutrons, and Electrons Practice Worksheet | Chegg.com - Free Printable
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Step-by-step solution for: Solved Protons. Neutrons, and Electrons Practice Worksheet | Chegg.com
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Show Answer Key & Explanations
Step-by-step solution for: Solved Protons. Neutrons, and Electrons Practice Worksheet | Chegg.com
Let's solve this step by step using the rules provided:
- # Protons = Atomic Number
- # Electrons = # Protons (in a neutral atom)
- # Neutrons = Atomic Mass – Atomic Number
We will fill in the table row by row, using the periodic table and the above rules.
---
- Element Symbol: B
- Mass Number: 11
- Atomic Number: 5
- Protons: 5
- Neutrons: 11 - 5 = 6
- Electrons: 5
✔ Already filled correctly.
---
- Element Symbol: Na
- Mass Number: 24
- Atomic Number: 11
- Protons: 11
- Neutrons: 24 - 11 = 13
- Electrons: 11
> Note: Sodium’s actual atomic mass is ~23, but here it's given as 24, so we use that.
---
- Element Symbol: Y
- Mass Number: 89
- Atomic Number: 39 (since electrons = 39 → protons = 39)
- Protons: 39
- Neutrons: 89 - 39 = 50
- Electrons: 39
---
- Element Symbol: Cu
- Mass Number: Not given? Wait — look at the row:
- Mass Number: ?
- Atomic Number: 29
- Protons: 29
- Neutrons: 35
- So, Mass Number = Protons + Neutrons = 29 + 35 = 64
- Electrons: 29
So:
- Mass Number: 64
- Electrons: 29
---
- Element Symbol: Te
- Mass Number: 98
- Protons: 43 → So Atomic Number = 43 → Element is Technetium, not Tellurium!
Wait! There's an error here.
Tellurium (Te) has atomic number 52, not 43.
But here, protons = 43 → That's Technetium (Tc), not Te.
So either:
- The element symbol is wrong, or
- The proton count is wrong.
But the problem says "Element Symbol: Te", and "Protons: 43" — that can't be right.
Let’s double-check:
- Te (Tellurium) has atomic number 52
- So if protons = 43, then it must be Tc (Technetium)
So likely a typo in the worksheet.
Assuming the element symbol is correct (Te), then:
- Atomic Number = 52
- Protons = 52
- But it says protons = 43 → contradiction.
Alternatively, if protons = 43, then element is Tc, not Te.
But the symbol is Te — so let’s assume the proton count is wrong.
Wait — maybe it's not Te? Let's check what element has:
- Mass Number: 98
- Protons: 43?
That would be Technetium-98, which is a radioactive isotope.
But the symbol is written as Te, which is incorrect.
So likely, the symbol should be Tc, not Te.
But since the worksheet says Te, perhaps it's a mistake.
Alternatively, maybe Te has mass 98 and atomic number 52, so:
- Protons = 52
- Neutrons = 98 - 52 = 46
- Electrons = 52
But the table says protons = 43 — which is wrong.
So this row has a problem.
Let’s assume the mass number is 98, and protons = 43, then:
- Element: Technetium (Tc), not Te
- So symbol should be Tc, not Te
But the worksheet says Te, so perhaps it's a typo.
We’ll go with the numbers given and infer the correct values.
Given:
- Element Symbol: Te (but likely wrong)
- Mass Number: 98
- Protons: 43 → So Atomic Number = 43 → Element is Tc
- So symbol should be Tc
- Neutrons: 98 - 43 = 55
- Electrons: 43
But since the symbol is listed as Te, and Te has atomic number 52, we have a conflict.
Wait — let’s recheck: Tellurium (Te) has atomic number 52, mass ~127.6
But here, mass = 98, protons = 43 → clearly not Te.
So probably a typo: the symbol should be Tc (Technetium).
But for now, we'll proceed with the data as given.
So:
- Name: Technetium (Tc)
- Symbol: Tc (but written as Te — error)
- Mass Number: 98
- Atomic Number: 43
- Protons: 43
- Neutrons: 98 - 43 = 55
- Electrons: 43
But since the table says Te, we might have to accept it as a mistake.
Alternatively, perhaps the proton count is wrong.
Let’s skip and come back.
---
- Symbol: Pb
- Mass Number: 207
- Atomic Number: 82 (from periodic table)
- Protons: 82
- Neutrons: 207 - 82 = 125
- Electrons: 82
---
- Symbol: Tl
- Mass Number: 204
- Atomic Number: 81
- Protons: 81
- Neutrons: 204 - 81 = 123
- Electrons: 81
---
- Symbol: H
- Mass Number: ? → But neutrons = 0
- Atomic Number: 1 (always)
- Protons: 1
- Neutrons: 0 → So mass number = 1
- Electrons: 1
So:
- Mass Number: 1
- Atomic Number: 1
- Protons: 1
- Electrons: 1
---
- Symbol: C
- Mass Number: 12
- Atomic Number: 6
- Protons: 6
- Neutrons: 12 - 6 = 6
- Electrons: 6
---
- Symbol: N
- Protons: 7 → Atomic Number = 7
- Mass Number: ? → Usually 14 for most stable isotope
- But not given — we need to find from periodic table
- Most common isotope: Nitrogen-14
- So Mass Number: 14
- Neutrons: 14 - 7 = 7
- Electrons: 7
---
- Symbol: Ba
- Electrons: 56 → So protons = 56 → Atomic Number = 56
- So element is Barium
- Mass Number: ? → Most common isotope is Ba-138
- But not given — we need to find.
- But in such problems, usually the mass number is implied from periodic table.
- Standard atomic mass of Ba ≈ 137.3
- So likely Mass Number = 138 (common isotope)
- Neutrons: 138 - 56 = 82
- Protons: 56
- Electrons: 56
So:
- Mass Number: 138
- Atomic Number: 56
- Protons: 56
- Neutrons: 82
- Electrons: 56
---
- Symbol: Ca
- Electrons: ? → Not given
- But we know Calcium has atomic number 20 → so protons = 20, electrons = 20
- Mass Number: ? → Common isotope is 40
- So Mass Number = 40
- Neutrons: 40 - 20 = 20
So:
- Mass Number: 40
- Atomic Number: 20
- Protons: 20
- Neutrons: 20
- Electrons: 20
---
- Symbol: Si
- Electrons: 14 → so protons = 14 → atomic number = 14
- Mass Number: ? → common isotope Si-28
- So Mass Number = 28
- Neutrons: 28 - 14 = 14
- Electrons: 14
So:
- Mass Number: 28
- Atomic Number: 14
- Protons: 14
- Neutrons: 14
- Electrons: 14
---
- Symbol: Ar
- Atomic Number: 18
- So protons = 18, electrons = 18
- Mass Number: ? → most common isotope is Ar-40
- So Mass Number = 40
- Neutrons: 40 - 18 = 22
So:
- Mass Number: 40
- Atomic Number: 18
- Protons: 18
- Neutrons: 22
- Electrons: 18
---
- Symbol: Mg
- Protons: 12 → atomic number = 12
- Electrons: 12
- Mass Number: ? → most common isotope Mg-24
- So Mass Number = 24
- Neutrons: 24 - 12 = 12
So:
- Mass Number: 24
- Atomic Number: 12
- Protons: 12
- Neutrons: 12
- Electrons: 12
---
Now let's go back to Te row.
- Symbol: Te
- Mass Number: 98
- Protons: 43 → This is wrong
- Because Te has atomic number 52
So if protons = 43, it's Tc, not Te
But if the symbol is Te, then:
- Atomic Number = 52
- Protons = 52
- Neutrons = 98 - 52 = 46
- Electrons = 52
So likely the proton count is wrong — should be 52, not 43.
But the table says 43.
Possibility: It's not Te, but Tc.
But the symbol is written as Te — probably a typo.
We'll assume the proton count is correct, so it's Tc, and symbol should be Tc.
But since the worksheet says Te, we'll note the discrepancy.
But for now, let's fill in based on logic.
---
| Name | Symbol | Mass # | Atomic # | Protons | Neutrons | Electrons |
|------|--------|--------|----------|---------|----------|-----------|
| Boron | B | 11 | 5 | 5 | 6 | 5 |
| Sodium | Na | 24 | 11 | 11 | 13 | 11 |
| Yttrium | Y | 89 | 39 | 39 | 50 | 39 |
| Copper | Cu | 64 | 29 | 29 | 35 | 29 |
| Tellurium (likely Tc) | Te (should be Tc) | 98 | 43 | 43 | 55 | 43 |
| Lead | Pb | 207 | 82 | 82 | 125 | 82 |
| Thallium | Tl | 204 | 81 | 81 | 123 | 81 |
| Hydrogen | H | 1 | 1 | 1 | 0 | 1 |
| Carbon | C | 12 | 6 | 6 | 6 | 6 |
| Nitrogen | N | 14 | 7 | 7 | 7 | 7 |
| Barium | Ba | 138 | 56 | 56 | 82 | 56 |
| Calcium | Ca | 40 | 20 | 20 | 20 | 20 |
| Silicon | Si | 28 | 14 | 14 | 14 | 14 |
| Argon | Ar | 40 | 18 | 18 | 22 | 18 |
| Magnesium | Mg | 24 | 12 | 12 | 12 | 12 |
---
- Te row: Likely a typo. If protons = 43, symbol should be Tc, not Te. Or if symbol is Te, protons should be 52.
- Sodium: Mass number 24 is unusual (natural sodium is 23), but acceptable for practice.
- Copper: Mass number 64 is plausible (Cu-64 is a radioisotope).
- Barium: Mass number 138 is standard.
- Others: All standard.
---
| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons |
|------------------|----------------|-------------|---------------|---------|----------|-----------|
| Boron | B | 11 | 5 | 5 | 6 | 5 |
| Sodium | Na | 24 | 11 | 11 | 13 | 11 |
| Yttrium | Y | 89 | 39 | 39 | 50 | 39 |
| Copper | Cu | 64 | 29 | 29 | 35 | 29 |
| Tellurium | Te | 98 | 52 | 52 | 46 | 52 |
| Lead | Pb | 207 | 82 | 82 | 125 | 82 |
| Thallium | Tl | 204 | 81 | 81 | 123 | 81 |
| Hydrogen | H | 1 | 1 | 1 | 0 | 1 |
| Carbon | C | 12 | 6 | 6 | 6 | 6 |
| Nitrogen | N | 14 | 7 | 7 | 7 | 7 |
| Barium | Ba | 138 | 56 | 56 | 82 | 56 |
| Calcium | Ca | 40 | 20 | 20 | 20 | 20 |
| Silicon | Si | 28 | 14 | 14 | 14 | 14 |
| Argon | Ar | 40 | 18 | 18 | 22 | 18 |
| Magnesium | Mg | 24 | 12 | 12 | 12 | 12 |
> Note: For Te, I corrected protons from 43 to 52 (since Te has atomic number 52). If the original was meant to be Tc, then protons = 43, neutrons = 55, and symbol should be Tc. But since symbol is Te, I used correct values.
Let me know if you want it adjusted for Tc instead.
Key Rules:
- # Protons = Atomic Number
- # Electrons = # Protons (in a neutral atom)
- # Neutrons = Atomic Mass – Atomic Number
We will fill in the table row by row, using the periodic table and the above rules.
---
1. Boron
- Element Symbol: B
- Mass Number: 11
- Atomic Number: 5
- Protons: 5
- Neutrons: 11 - 5 = 6
- Electrons: 5
✔ Already filled correctly.
---
2. Sodium
- Element Symbol: Na
- Mass Number: 24
- Atomic Number: 11
- Protons: 11
- Neutrons: 24 - 11 = 13
- Electrons: 11
> Note: Sodium’s actual atomic mass is ~23, but here it's given as 24, so we use that.
---
3. Y (Yttrium)
- Element Symbol: Y
- Mass Number: 89
- Atomic Number: 39 (since electrons = 39 → protons = 39)
- Protons: 39
- Neutrons: 89 - 39 = 50
- Electrons: 39
---
4. Copper
- Element Symbol: Cu
- Mass Number: Not given? Wait — look at the row:
- Mass Number: ?
- Atomic Number: 29
- Protons: 29
- Neutrons: 35
- So, Mass Number = Protons + Neutrons = 29 + 35 = 64
- Electrons: 29
So:
- Mass Number: 64
- Electrons: 29
---
5. Tellurium (Te)
- Element Symbol: Te
- Mass Number: 98
- Protons: 43 → So Atomic Number = 43 → Element is Technetium, not Tellurium!
Wait! There's an error here.
Tellurium (Te) has atomic number 52, not 43.
But here, protons = 43 → That's Technetium (Tc), not Te.
So either:
- The element symbol is wrong, or
- The proton count is wrong.
But the problem says "Element Symbol: Te", and "Protons: 43" — that can't be right.
Let’s double-check:
- Te (Tellurium) has atomic number 52
- So if protons = 43, then it must be Tc (Technetium)
So likely a typo in the worksheet.
Assuming the element symbol is correct (Te), then:
- Atomic Number = 52
- Protons = 52
- But it says protons = 43 → contradiction.
Alternatively, if protons = 43, then element is Tc, not Te.
But the symbol is Te — so let’s assume the proton count is wrong.
Wait — maybe it's not Te? Let's check what element has:
- Mass Number: 98
- Protons: 43?
That would be Technetium-98, which is a radioactive isotope.
But the symbol is written as Te, which is incorrect.
So likely, the symbol should be Tc, not Te.
But since the worksheet says Te, perhaps it's a mistake.
Alternatively, maybe Te has mass 98 and atomic number 52, so:
- Protons = 52
- Neutrons = 98 - 52 = 46
- Electrons = 52
But the table says protons = 43 — which is wrong.
So this row has a problem.
Let’s assume the mass number is 98, and protons = 43, then:
- Element: Technetium (Tc), not Te
- So symbol should be Tc, not Te
But the worksheet says Te, so perhaps it's a typo.
We’ll go with the numbers given and infer the correct values.
Given:
- Element Symbol: Te (but likely wrong)
- Mass Number: 98
- Protons: 43 → So Atomic Number = 43 → Element is Tc
- So symbol should be Tc
- Neutrons: 98 - 43 = 55
- Electrons: 43
But since the symbol is listed as Te, and Te has atomic number 52, we have a conflict.
Wait — let’s recheck: Tellurium (Te) has atomic number 52, mass ~127.6
But here, mass = 98, protons = 43 → clearly not Te.
So probably a typo: the symbol should be Tc (Technetium).
But for now, we'll proceed with the data as given.
So:
- Name: Technetium (Tc)
- Symbol: Tc (but written as Te — error)
- Mass Number: 98
- Atomic Number: 43
- Protons: 43
- Neutrons: 98 - 43 = 55
- Electrons: 43
But since the table says Te, we might have to accept it as a mistake.
Alternatively, perhaps the proton count is wrong.
Let’s skip and come back.
---
6. Lead (Pb)
- Symbol: Pb
- Mass Number: 207
- Atomic Number: 82 (from periodic table)
- Protons: 82
- Neutrons: 207 - 82 = 125
- Electrons: 82
---
7. Thallium
- Symbol: Tl
- Mass Number: 204
- Atomic Number: 81
- Protons: 81
- Neutrons: 204 - 81 = 123
- Electrons: 81
---
8. Hydrogen (H)
- Symbol: H
- Mass Number: ? → But neutrons = 0
- Atomic Number: 1 (always)
- Protons: 1
- Neutrons: 0 → So mass number = 1
- Electrons: 1
So:
- Mass Number: 1
- Atomic Number: 1
- Protons: 1
- Electrons: 1
---
9. Carbon
- Symbol: C
- Mass Number: 12
- Atomic Number: 6
- Protons: 6
- Neutrons: 12 - 6 = 6
- Electrons: 6
---
10. Nitrogen (N)
- Symbol: N
- Protons: 7 → Atomic Number = 7
- Mass Number: ? → Usually 14 for most stable isotope
- But not given — we need to find from periodic table
- Most common isotope: Nitrogen-14
- So Mass Number: 14
- Neutrons: 14 - 7 = 7
- Electrons: 7
---
11. Barium (Ba)
- Symbol: Ba
- Electrons: 56 → So protons = 56 → Atomic Number = 56
- So element is Barium
- Mass Number: ? → Most common isotope is Ba-138
- But not given — we need to find.
- But in such problems, usually the mass number is implied from periodic table.
- Standard atomic mass of Ba ≈ 137.3
- So likely Mass Number = 138 (common isotope)
- Neutrons: 138 - 56 = 82
- Protons: 56
- Electrons: 56
So:
- Mass Number: 138
- Atomic Number: 56
- Protons: 56
- Neutrons: 82
- Electrons: 56
---
12. Calcium
- Symbol: Ca
- Electrons: ? → Not given
- But we know Calcium has atomic number 20 → so protons = 20, electrons = 20
- Mass Number: ? → Common isotope is 40
- So Mass Number = 40
- Neutrons: 40 - 20 = 20
So:
- Mass Number: 40
- Atomic Number: 20
- Protons: 20
- Neutrons: 20
- Electrons: 20
---
13. Silicon (Si)
- Symbol: Si
- Electrons: 14 → so protons = 14 → atomic number = 14
- Mass Number: ? → common isotope Si-28
- So Mass Number = 28
- Neutrons: 28 - 14 = 14
- Electrons: 14
So:
- Mass Number: 28
- Atomic Number: 14
- Protons: 14
- Neutrons: 14
- Electrons: 14
---
14. Argon
- Symbol: Ar
- Atomic Number: 18
- So protons = 18, electrons = 18
- Mass Number: ? → most common isotope is Ar-40
- So Mass Number = 40
- Neutrons: 40 - 18 = 22
So:
- Mass Number: 40
- Atomic Number: 18
- Protons: 18
- Neutrons: 22
- Electrons: 18
---
15. Magnesium (Mg)
- Symbol: Mg
- Protons: 12 → atomic number = 12
- Electrons: 12
- Mass Number: ? → most common isotope Mg-24
- So Mass Number = 24
- Neutrons: 24 - 12 = 12
So:
- Mass Number: 24
- Atomic Number: 12
- Protons: 12
- Neutrons: 12
- Electrons: 12
---
Now let's go back to Te row.
Revisit: Te
- Symbol: Te
- Mass Number: 98
- Protons: 43 → This is wrong
- Because Te has atomic number 52
So if protons = 43, it's Tc, not Te
But if the symbol is Te, then:
- Atomic Number = 52
- Protons = 52
- Neutrons = 98 - 52 = 46
- Electrons = 52
So likely the proton count is wrong — should be 52, not 43.
But the table says 43.
Possibility: It's not Te, but Tc.
But the symbol is written as Te — probably a typo.
We'll assume the proton count is correct, so it's Tc, and symbol should be Tc.
But since the worksheet says Te, we'll note the discrepancy.
But for now, let's fill in based on logic.
---
Final Table (corrected):
| Name | Symbol | Mass # | Atomic # | Protons | Neutrons | Electrons |
|------|--------|--------|----------|---------|----------|-----------|
| Boron | B | 11 | 5 | 5 | 6 | 5 |
| Sodium | Na | 24 | 11 | 11 | 13 | 11 |
| Yttrium | Y | 89 | 39 | 39 | 50 | 39 |
| Copper | Cu | 64 | 29 | 29 | 35 | 29 |
| Tellurium (likely Tc) | Te (should be Tc) | 98 | 43 | 43 | 55 | 43 |
| Lead | Pb | 207 | 82 | 82 | 125 | 82 |
| Thallium | Tl | 204 | 81 | 81 | 123 | 81 |
| Hydrogen | H | 1 | 1 | 1 | 0 | 1 |
| Carbon | C | 12 | 6 | 6 | 6 | 6 |
| Nitrogen | N | 14 | 7 | 7 | 7 | 7 |
| Barium | Ba | 138 | 56 | 56 | 82 | 56 |
| Calcium | Ca | 40 | 20 | 20 | 20 | 20 |
| Silicon | Si | 28 | 14 | 14 | 14 | 14 |
| Argon | Ar | 40 | 18 | 18 | 22 | 18 |
| Magnesium | Mg | 24 | 12 | 12 | 12 | 12 |
---
Corrections:
- Te row: Likely a typo. If protons = 43, symbol should be Tc, not Te. Or if symbol is Te, protons should be 52.
- Sodium: Mass number 24 is unusual (natural sodium is 23), but acceptable for practice.
- Copper: Mass number 64 is plausible (Cu-64 is a radioisotope).
- Barium: Mass number 138 is standard.
- Others: All standard.
---
Final Answer (filled table):
| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons |
|------------------|----------------|-------------|---------------|---------|----------|-----------|
| Boron | B | 11 | 5 | 5 | 6 | 5 |
| Sodium | Na | 24 | 11 | 11 | 13 | 11 |
| Yttrium | Y | 89 | 39 | 39 | 50 | 39 |
| Copper | Cu | 64 | 29 | 29 | 35 | 29 |
| Tellurium | Te | 98 | 52 | 52 | 46 | 52 |
| Lead | Pb | 207 | 82 | 82 | 125 | 82 |
| Thallium | Tl | 204 | 81 | 81 | 123 | 81 |
| Hydrogen | H | 1 | 1 | 1 | 0 | 1 |
| Carbon | C | 12 | 6 | 6 | 6 | 6 |
| Nitrogen | N | 14 | 7 | 7 | 7 | 7 |
| Barium | Ba | 138 | 56 | 56 | 82 | 56 |
| Calcium | Ca | 40 | 20 | 20 | 20 | 20 |
| Silicon | Si | 28 | 14 | 14 | 14 | 14 |
| Argon | Ar | 40 | 18 | 18 | 22 | 18 |
| Magnesium | Mg | 24 | 12 | 12 | 12 | 12 |
> Note: For Te, I corrected protons from 43 to 52 (since Te has atomic number 52). If the original was meant to be Tc, then protons = 43, neutrons = 55, and symbol should be Tc. But since symbol is Te, I used correct values.
Let me know if you want it adjusted for Tc instead.
Parent Tip: Review the logic above to help your child master the concept of protons neutrons electrons worksheet.
