Isotopes Worksheet - Type shit - SUBATOMIC PARTICLES and ISOTOPES ... - Free Printable
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Step-by-step solution for: Isotopes Worksheet - Type shit - SUBATOMIC PARTICLES and ISOTOPES ...
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Step-by-step solution for: Isotopes Worksheet - Type shit - SUBATOMIC PARTICLES and ISOTOPES ...
Let's go through the Subatomic Particles and Isotopes Worksheet step by step, verify all answers, and explain each solution clearly.
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We are given a table with information about various atoms. All atoms are neutral, so:
> ✔ Number of protons = Number of electrons
> ✔ Mass number = Protons + Neutrons
Let’s verify each row:
---
#### 1. Oxygen
- Atomic Number: 8 → protons = 8
- Mass Number: 17 → neutrons = 17 - 8 = 9
- Electrons = 8 (neutral atom)
- Isotopic notation: $^{17}_{8}\text{O}$
✔ Correct
---
#### 2. Phosphorus
- Atomic Number: 15 → protons = 15
- Mass Number: 31 → neutrons = 31 - 15 = 16
- Electrons = 15
- Isotopic notation: $^{31}_{15}\text{P}$
✔ Correct
---
#### 3. Strontium
- Atomic Number: 38 → protons = 38
- Neutrons: 50 → mass number = 38 + 50 = 88
- Electrons = 38
- Isotopic notation: $^{88}_{38}\text{Sr}$
✔ Correct
---
#### 4. Neon
- Atomic Number: 10 → protons = 10
- Mass Number: 20 → neutrons = 20 - 10 = 10
- Electrons = 10
- Isotopic notation: $^{20}_{10}\text{Ne}$
✔ Correct
---
#### 5. Fluorine
- Atomic Number: 9 → protons = 9
- Neutrons: 10 → mass number = 9 + 10 = 19
- Electrons = 9
- Isotopic notation: $^{19}_{9}\text{F}$
✔ Correct
---
#### 6. Gold
- Atomic Number: 79 → protons = 79
- Mass Number: 197 → neutrons = 197 - 79 = 118
- Electrons = 79
- Isotopic notation: $^{197}_{79}\text{Au}$
✔ Correct
---
✔ All entries in the table are correct!
---
#### 1) The atom with 2 neutrons and 1 proton is:
- Protons = 1 → atomic number = 1 → element = Hydrogen
- Mass number = 1 + 2 = 3
→ So, it's hydrogen-3 or tritium
✔ Answer: Hydrogen-3 ✔️
---
#### 2) The atom with 17 electrons and 18 neutrons is:
- Since neutral: electrons = protons → protons = 17
- Atomic number = 17 → element = Chlorine
- Neutrons = 18 → mass number = 17 + 18 = 35
→ So, chlorine-35
✔ Answer: Chlorine-35 ✔️
---
#### 3) The atom with 6 protons and 8 neutrons is:
- Protons = 6 → atomic number = 6 → element = Carbon
- Mass number = 6 + 8 = 14
→ So, carbon-14
✔ Answer: Carbon-14 ✔️
---
#### 4) An atom contains 55 protons. What is the element symbol?
- Atomic number = 55 → Element = Cesium
- Symbol: Cs
✔ Answer: Cs ✔️
---
#### 5) An atom has:
- 31 protons
- 39 neutrons
- 31 electrons
Find the mass number:
- Mass number = protons + neutrons = 31 + 39 = 70
✔ Answer: 70 ✔️
---
#### 6) What is the atomic number of bromine?
- From periodic table: Bromine (Br) has atomic number 35
✔ Answer: 35 ✔️
---
#### 7) Total subatomic particles in B-11:
- B = Boron → atomic number = 5 → protons = 5
- Mass number = 11 → neutrons = 11 - 5 = 6
- Electrons = 5 (neutral atom)
Total subatomic particles = protons + neutrons + electrons =
5 + 6 + 5 = 16
✔ Answer: 16 ✔️
---
#### 8) Atomic number of Zn-65?
- Zn = Zinc → atomic number = 30
- The "65" is the mass number, not atomic number.
✔ Answer: 30 ✘ Wait — student wrote 36, which is incorrect.
✘ Mistake here: The atomic number of zinc is 30, not 36.
Correct answer: 30
---
#### 9) How many neutrons in Hg-201?
- Hg = Mercury → atomic number = 80 → protons = 80
- Mass number = 201
- Neutrons = 201 - 80 = 121
✔ Answer: 121 ✔️
---
| Question | Student Answer | Correct Answer | Explanation |
|--------|----------------|----------------|-------------|
| 8 | 36 | 30 | Atomic number of Zn is 30, not 36. Zn-65 means mass number 65, but atomic number remains 30. |
---
#### Table: All entries are correct.
#### Identify Atoms:
1. Hydrogen-3 ✔️
2. Chlorine-35 ✔️
3. Carbon-14 ✔️
#### Questions:
4. Cs ✔️
5. 70 ✔️
6. 35 ✔️
7. 16 ✔️
8. 30 ✘ (Student said 36)
9. 121 ✔️
---
> What is the atomic number of Zn-65?
> → 30
Because zinc (Zn) has an atomic number of 30, regardless of the isotope.
---
- Atomic number = number of protons = number of electrons (in neutral atoms)
- Mass number = protons + neutrons
- Isotopic notation: $^{A}_{Z}\text{X}$ where A = mass number, Z = atomic number
- Neutrons = A – Z
---
✔ All other answers are correct. Only Q8 needs correction.
Let me know if you'd like this as a printable corrected version!
---
🔹 Part 1: Complete the Table
We are given a table with information about various atoms. All atoms are neutral, so:
> ✔ Number of protons = Number of electrons
> ✔ Mass number = Protons + Neutrons
Let’s verify each row:
---
#### 1. Oxygen
- Atomic Number: 8 → protons = 8
- Mass Number: 17 → neutrons = 17 - 8 = 9
- Electrons = 8 (neutral atom)
- Isotopic notation: $^{17}_{8}\text{O}$
✔ Correct
---
#### 2. Phosphorus
- Atomic Number: 15 → protons = 15
- Mass Number: 31 → neutrons = 31 - 15 = 16
- Electrons = 15
- Isotopic notation: $^{31}_{15}\text{P}$
✔ Correct
---
#### 3. Strontium
- Atomic Number: 38 → protons = 38
- Neutrons: 50 → mass number = 38 + 50 = 88
- Electrons = 38
- Isotopic notation: $^{88}_{38}\text{Sr}$
✔ Correct
---
#### 4. Neon
- Atomic Number: 10 → protons = 10
- Mass Number: 20 → neutrons = 20 - 10 = 10
- Electrons = 10
- Isotopic notation: $^{20}_{10}\text{Ne}$
✔ Correct
---
#### 5. Fluorine
- Atomic Number: 9 → protons = 9
- Neutrons: 10 → mass number = 9 + 10 = 19
- Electrons = 9
- Isotopic notation: $^{19}_{9}\text{F}$
✔ Correct
---
#### 6. Gold
- Atomic Number: 79 → protons = 79
- Mass Number: 197 → neutrons = 197 - 79 = 118
- Electrons = 79
- Isotopic notation: $^{197}_{79}\text{Au}$
✔ Correct
---
✔ All entries in the table are correct!
---
🔹 Part 2: Identify Neutral Atoms
#### 1) The atom with 2 neutrons and 1 proton is:
- Protons = 1 → atomic number = 1 → element = Hydrogen
- Mass number = 1 + 2 = 3
→ So, it's hydrogen-3 or tritium
✔ Answer: Hydrogen-3 ✔️
---
#### 2) The atom with 17 electrons and 18 neutrons is:
- Since neutral: electrons = protons → protons = 17
- Atomic number = 17 → element = Chlorine
- Neutrons = 18 → mass number = 17 + 18 = 35
→ So, chlorine-35
✔ Answer: Chlorine-35 ✔️
---
#### 3) The atom with 6 protons and 8 neutrons is:
- Protons = 6 → atomic number = 6 → element = Carbon
- Mass number = 6 + 8 = 14
→ So, carbon-14
✔ Answer: Carbon-14 ✔️
---
🔹 Part 3: Questions Using Chemistry & Periodic Table
#### 4) An atom contains 55 protons. What is the element symbol?
- Atomic number = 55 → Element = Cesium
- Symbol: Cs
✔ Answer: Cs ✔️
---
#### 5) An atom has:
- 31 protons
- 39 neutrons
- 31 electrons
Find the mass number:
- Mass number = protons + neutrons = 31 + 39 = 70
✔ Answer: 70 ✔️
---
#### 6) What is the atomic number of bromine?
- From periodic table: Bromine (Br) has atomic number 35
✔ Answer: 35 ✔️
---
#### 7) Total subatomic particles in B-11:
- B = Boron → atomic number = 5 → protons = 5
- Mass number = 11 → neutrons = 11 - 5 = 6
- Electrons = 5 (neutral atom)
Total subatomic particles = protons + neutrons + electrons =
5 + 6 + 5 = 16
✔ Answer: 16 ✔️
---
#### 8) Atomic number of Zn-65?
- Zn = Zinc → atomic number = 30
- The "65" is the mass number, not atomic number.
✔ Answer: 30 ✘ Wait — student wrote 36, which is incorrect.
✘ Mistake here: The atomic number of zinc is 30, not 36.
Correct answer: 30
---
#### 9) How many neutrons in Hg-201?
- Hg = Mercury → atomic number = 80 → protons = 80
- Mass number = 201
- Neutrons = 201 - 80 = 121
✔ Answer: 121 ✔️
---
🟨 Summary of Corrections
| Question | Student Answer | Correct Answer | Explanation |
|--------|----------------|----------------|-------------|
| 8 | 36 | 30 | Atomic number of Zn is 30, not 36. Zn-65 means mass number 65, but atomic number remains 30. |
---
✔ Final Answers with Explanations:
#### Table: All entries are correct.
#### Identify Atoms:
1. Hydrogen-3 ✔️
2. Chlorine-35 ✔️
3. Carbon-14 ✔️
#### Questions:
4. Cs ✔️
5. 70 ✔️
6. 35 ✔️
7. 16 ✔️
8. 30 ✘ (Student said 36)
9. 121 ✔️
---
✔ Corrected Final Answer for Question 8:
> What is the atomic number of Zn-65?
> → 30
Because zinc (Zn) has an atomic number of 30, regardless of the isotope.
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💡 Key Concepts Recap:
- Atomic number = number of protons = number of electrons (in neutral atoms)
- Mass number = protons + neutrons
- Isotopic notation: $^{A}_{Z}\text{X}$ where A = mass number, Z = atomic number
- Neutrons = A – Z
---
✔ All other answers are correct. Only Q8 needs correction.
Let me know if you'd like this as a printable corrected version!
Parent Tip: Review the logic above to help your child master the concept of isotope worksheet.
