Let's solve the
Element Practice worksheet step by step. The goal is to fill in the missing information for each element based on its atomic number, atomic mass, and other properties.
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🔍 Key Concepts:
-
Atomic Number (Z): Number of protons in the nucleus.
-
Atomic Mass (A): Approximate total number of protons + neutrons (mass number).
-
Neutrons: Calculated as:
$$
\text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number}
$$
-
Electrons: In a neutral atom, electrons = protons = atomic number.
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Now, let’s go through each element one by one:
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1. He (Helium)
- Atomic number: 2
- Atomic mass: 4
- Protons: 2
- Electrons: 2
- Neutrons: 4 - 2 =
2
✔ Filled:
- Element: He
- Protons: 2
- Electrons: 2
- Neutrons: 2
---
2. Fe (Iron)
- Atomic number: 26
- Atomic mass: 56
- Protons: 26
- Electrons: 26
- Neutrons: 56 - 26 =
30
✔ Filled:
- Element: Fe
- Protons: 26
- Electrons: 26
- Neutrons: 30
---
3. Al (Aluminum)
- Atomic number: 13
- Atomic mass: 27
- Protons: 13
- Electrons: 13
- Neutrons: 27 - 13 =
14
✔ Filled:
- Element: Al
- Protons: 13
- Electrons: 13
- Neutrons: 14
---
4. Ca (Calcium)
- Atomic number: 20
- Atomic mass: 40
- Protons: 20
- Electrons: 20
- Neutrons: 40 - 20 =
20
✔ Filled:
- Element: Ca
- Protons: 20
- Electrons: 20
- Neutrons: 20
---
5. Ne (Neon)
- Atomic number: 10
- Atomic mass: 20
- Protons: 10
- Electrons: 10
- Neutrons: 20 - 10 =
10
✔ Filled:
- Element: Ne
- Protons: 10
- Electrons: 10
- Neutrons: 10
---
6. C (Carbon)
- Atomic number: 6
- Atomic mass: 12
- Protons: 6
- Electrons: 6
- Neutrons: 12 - 6 =
6
✔ Filled:
- Element: C
- Protons: 6
- Electrons: 6
- Neutrons: 6
---
7. F (Fluorine)
- Atomic number: 9
- Atomic mass: 19
- Protons: 9
- Electrons: 9
- Neutrons: 19 - 9 =
10
✔ Filled:
- Element: F
- Protons: 9
- Electrons: 9
- Neutrons: 10
---
8. Cl (Chlorine)
- Atomic number: 17
- Atomic mass: 35
- Protons: 17
- Electrons: 17
- Neutrons: 35 - 17 =
18
✔ Filled:
- Element: Cl
- Protons: 17
- Electrons: 17
- Neutrons: 18
---
9. Na (Sodium)
- Atomic number: 11
- Atomic mass: 23
- Protons: 11
- Electrons: 11
- Neutrons: 23 - 11 =
12
✔ Filled:
- Element: Na
- Protons: 11
- Electrons: 11
- Neutrons: 12
---
✔ Final Answer Table:
| Element | Protons | Electrons | Neutrons |
|--------|--------|----------|---------|
| He | 2 | 2 | 2 |
| Fe | 26 | 26 | 30 |
| Al | 13 | 13 | 14 |
| Ca | 20 | 20 | 20 |
| Ne | 10 | 10 | 10 |
| C | 6 | 6 | 6 |
| F | 9 | 9 | 10 |
| Cl | 17 | 17 | 18 |
| Na | 11 | 11 | 12 |
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📌 Summary:
You can use this method for any element:
-
Protons = Atomic number
-
Electrons = Protons (in neutral atoms)
-
Neutrons = Atomic mass – Atomic number
This practice helps reinforce understanding of the periodic table and subatomic particles.
Let me know if you'd like this formatted as a printable worksheet!
Parent Tip: Review the logic above to help your child master the concept of element worksheet answers.
