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"Atomic Structure: KEY", which includes information about atomic structure, Bohr models, and electron configurations. Since I can't view images directly, I’ll help you solve the problems based on the description and content typically found in such worksheets.
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🔹 Part 1: Understanding Atomic Information
The worksheet shows examples of elements with their atomic symbols, atomic numbers, and atomic masses.
#### Example Elements:
-
Oxygen (O)
- Atomic Number: 8
- Element Symbol: O
- Atomic Mass: ~16.00
-
Carbon (C)
- Atomic Number: 6
- Element Symbol: C
- Atomic Mass: ~12.01
-
Neon (Ne)
- Atomic Number: 10
- Element Symbol: Ne
- Atomic Mass: ~20.18
-
Potassium (K)
- Atomic Number: 19
- Element Symbol: K
- Atomic Mass: ~39.10
#### Questions:
>
What 2 parts of an atom does the atomic # represent?
✔ The
atomic number represents:
1. The number of
protons in the nucleus.
2. The number of
electrons in a neutral atom.
>
What is the atomic # of oxygen?
✔ 8
>
How do you figure out the # of neutrons?
✔ Use the formula:
Number of neutrons = Atomic mass (rounded) – Atomic number
For example, Oxygen:
16 (mass) – 8 (atomic number) =
8 neutrons
---
🔹 Part 2: Creating Bohr Diagrams
This section asks students to sketch atoms using the
Bohr model, which shows electrons in energy levels (shells).
#### Rules for Arranging Electrons:
1. The
1st energy level holds up to
2 electrons.
2. The
2nd energy level holds up to
8 electrons.
3. The
3rd energy level holds up to
8 electrons (for these basic atoms).
4. Electrons fill shells from the inside out.
---
🔹 Sketching Atoms: Boron & Lithium
Let’s go through each one.
---
####
✔ Boron (B)
- Atomic Number: 5 → So, 5 protons and 5 electrons
- Electron configuration:
- 1st shell: 2 electrons
- 2nd shell: 3 electrons
Bohr Diagram:
```
•
/ \
/ \
/ \
• •
/ \
/ \
• •
```
But more clearly:
- Nucleus: 5 protons (+), 6 neutrons (since atomic mass ≈ 11, so 11–5=6)
- 1st orbit (inner): 2 electrons
- 2nd orbit (outer): 3 electrons
>
Term used to describe electrons in the outermost energy level?
✔ Valence electrons
So, Boron has
3 valence electrons.
---
####
✔ Lithium (Li)
- Atomic Number: 3 → 3 protons, 3 electrons
- Electron configuration:
- 1st shell: 2 electrons
- 2nd shell: 1 electron
Bohr Diagram:
- Nucleus: 3 protons, 4 neutrons (mass ≈ 7 → 7–3=4)
- 1st shell: 2 electrons
- 2nd shell: 1 electron
>
Valence electrons?
✔ 1 valence electron
---
✔ Summary Answers:
| Question | Answer |
|--------|--------|
| What does atomic number represent? | Number of protons and electrons in a neutral atom |
| Atomic number of oxygen? | 8 |
| How to find number of neutrons? | Atomic mass (rounded) – atomic number |
| Valence electrons in boron? | 3 |
| Valence electrons in lithium? | 1 |
| Term for outermost electrons? |
Valence electrons |
---
🧠 Final Notes:
- The
Bohr model helps visualize how electrons are arranged around the nucleus.
- The
valence electrons determine chemical behavior and bonding.
- Always start filling electrons from the lowest energy level first.
If you have specific questions about any part of the worksheet or need help drawing a particular atom, let me know!
Parent Tip: Review the logic above to help your child master the concept of structure of the atom worksheet.
