Atomic Structure Worksheet by For the Love of Science | TPT - Free Printable

It looks like you've uploaded a worksheet titled "Atomic Structure" that focuses on understanding atomic structure, electron configuration, and drawing Bohr diagrams. However, since I can't view images directly, I’ll help you solve the problems based on the text you’ve provided.

Let’s go through each section of the worksheet step by step and fill in the blanks with correct answers and explanations.

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Part 1: Atomic Symbols & Information

#### Oxygen (O)
- Symbol: O
- Atomic Number: 8
- Mass Number: 16

Questions:
1. What 2 parts of an atom does the atomic # represent?
→ The atomic number represents:
- The number of protons in the nucleus.
- The number of electrons in a neutral atom.

2. How do you figure out the # of neutrons?
→ Use this formula:
Neutrons = Mass Number – Atomic Number
For oxygen: 16 – 8 = 8 neutrons

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#### Carbon (C)
- Atomic Number: 6
- Mass Number: 12

So:
- p⁺ = 6
- n⁰ = 12 – 6 = 6
- e⁻ = 6

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#### Neon (Ne)
- Atomic Number: 10
- Mass Number: 20

So:
- p⁺ = 10
- n⁰ = 20 – 10 = 10
- e⁻ = 10

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#### Potassium (K)
- Atomic Number: 19
- Mass Number: 39

So:
- p⁺ = 19
- n⁰ = 39 – 19 = 20
- e⁻ = 19

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Part 2: Rules for Arranging Electrons

Fill in the blanks:

1. The 1st energy level can hold up to 2 electrons.
2. The 2nd energy level can hold up to 8 electrons.
3. The 3rd energy level can hold up to 8 electrons.

> Note: Actually, the 3rd energy level can hold up to 18, but in Bohr model simplifications (especially for high school), it's often capped at 8 for the outermost shell due to the octet rule. So we follow the simplified version here.

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Term for electrons in the outermost energy level

→ The term used is valence electrons.

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Part 3: Sketching Bohr Diagrams

You are asked to sketch two atoms. Let's assume one is Carbon (C) and the other is Oxygen (O) — common examples.

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#### Sketch a Carbon Atom (C)

- Atomic Number: 6 → 6 protons, 6 electrons
- Mass Number: 12 → 6 neutrons

Electron Configuration:
- 1st shell: 2 electrons
- 2nd shell: 4 electrons

Bohr Diagram Steps:
1. Draw a circle for the nucleus.
2. Inside the nucleus, write "6p⁺" and "6n⁰".
3. Draw a small circle around the nucleus (1st shell) with 2 electrons (dots).
4. Draw a larger circle (2nd shell) around it with 4 electrons.

Final Bohr Diagram (description):
```
●●
/ \
● ●
/ \
● ●
/ \
● ●
```
(But better drawn as concentric circles.)

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#### Sketch an Oxygen Atom (O)

- Atomic Number: 8 → 8 protons, 8 electrons
- Mass Number: 16 → 8 neutrons

Electron Configuration:
- 1st shell: 2 electrons
- 2nd shell: 6 electrons

Bohr Diagram:
- Nucleus: 8p⁺, 8n⁰
- 1st shell: 2 electrons
- 2nd shell: 6 electrons

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Summary of Answers

| Element | p⁺ | n⁰ | e⁻ |
|--------|----|----|----|
| O | 8 | 8 | 8 |
| C | 6 | 6 | 6 |
| Ne | 10 | 10 | 10 |
| K | 19 | 20 | 19 |

Rules:
1. 1st energy level → 2 electrons
2. 2nd → 8 electrons
3. 3rd → 8 electrons (in simplified model)

Outermost electrons → Valence electrons

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✔ Final Answer Summary:

- Atomic # represents: Protons and electrons (in neutral atoms)
- Neutrons = Mass Number – Atomic Number
- Valence electrons are electrons in the outermost shell
- Bohr diagrams show electrons in shells around the nucleus, following filling rules

If you'd like, you can now draw the Bohr diagrams using these instructions. Let me know if you’d like a visual representation or help with another element!