Atomic Structure Worksheet - Shelby County Schools - Flip eBook ... - Free Printable

Let's solve this "Atomic Math Challenge" step by step. This worksheet is designed to help you understand the periodic table and how to interpret atomic information.

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🔹 First: Understand the Periodic Table Box Layout

Each box on the periodic table includes:

- Top-left number: Atomic number (number of protons)
- Symbol: Chemical symbol
- Name: Element name
- Bottom number: Atomic mass (average mass of isotopes)

Also:
- Atomic number = number of protons = number of electrons (in a neutral atom)
- Atomic mass ≈ number of protons + number of neutrons
- So, Number of neutrons = Atomic mass (rounded) – Atomic number

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✔ Fill in the blanks for the Oxygen example:

```
8
O
Oxygen
15.999
```

Label the parts:
- Top-left (8): Atomic Number
- Symbol (O): Chemical Symbol
- Name (Oxygen): Element Name
- Bottom (15.999): Atomic Mass

Now fill in:

> Atomic number equals the number of:
> protons or electrons

> Atomic mass equals the number of:
> protons + neutrons

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Now let’s complete each element below.

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## 🟦 1. Oxygen (O)

Given:
- Atomic number = 8
- Atomic mass = 15.999 ≈ 16
- Symbol: O
- Name: Oxygen

Fill in:
- Atomic # = 8
- Atomic Mass = 15.999
- # of Protons = 8
- # of Neutrons = 16 - 8 = 8
- # of Electrons = 8

✔ Done.

---

## 🟨 2. Zinc (Zn)

Given:
- Atomic number = 30
- Atomic mass = 65.39 ≈ 65
- Symbol: Zn
- Name: Zinc

Fill in:
- Atomic # = 30
- Atomic Mass = 65.39
- # of Protons = 30
- # of Neutrons = 65 - 30 = 35
- # of Electrons = 30

✔ Done.

---

## 🟩 3. Lithium (Li)

Given:
- Atomic number = 3
- Atomic mass = 6.941 ≈ 7
- Symbol: Li
- Name: Lithium

Fill in:
- Atomic # = 3
- Atomic Mass = 6.941
- # of Protons = 3
- # of Neutrons = 7 - 3 = 4
- # of Electrons = 3

✔ Done.

---

## 🟪 4. Silicon (Si)

Given:
- Atomic number = 14
- Atomic mass = 28.086 ≈ 28
- Symbol: Si
- Name: Silicon

Fill in:
- Atomic # = 14
- Atomic Mass = 28.086
- # of Protons = 14
- # of Neutrons = 28 - 14 = 14
- # of Electrons = 14

✔ Done.

---

## 🟫 5. Boron (B)

Given:
- Atomic number = 5
- Atomic mass = 10.81 ≈ 11
- Symbol: B
- Name: Boron

Fill in:
- Atomic # = 5
- Atomic Mass = 10.81
- # of Protons = 5
- # of Neutrons = 11 - 5 = 6
- # of Electrons = 5

✔ Done.

---

## 🟥 6. Bromine (Br)

Given:
- Atomic number = 35
- Atomic mass = 79.904 ≈ 80
- Symbol: Br
- Name: Bromine

Fill in:
- Atomic # = 35
- Atomic Mass = 79.904
- # of Protons = 35
- # of Neutrons = 80 - 35 = 45
- # of Electrons = 35

✔ Done.

---

✔ Final Answer Summary

#### 🔹 Definitions:
- Atomic number = number of protons or electrons
- Atomic mass = number of protons + neutrons

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📋 Completed Worksheet Answers

#### Oxygen
- Atomic # = 8
- Atomic Mass = 15.999
- # of Protons = 8
- # of Neutrons = 8
- # of Electrons = 8

#### Zinc
- Atomic # = 30
- Atomic Mass = 65.39
- # of Protons = 30
- # of Neutrons = 35
- # of Electrons = 30

#### Lithium
- Atomic # = 3
- Atomic Mass = 6.941
- # of Protons = 3
- # of Neutrons = 4
- # of Electrons = 3

#### Silicon
- Atomic # = 14
- Atomic Mass = 28.086
- # of Protons = 14
- # of Neutrons = 14
- # of Electrons = 14

#### Boron
- Atomic # = 5
- Atomic Mass = 10.81
- # of Protons = 5
- # of Neutrons = 6
- # of Electrons = 5

#### Bromine
- Atomic # = 35
- Atomic Mass = 79.904
- # of Protons = 35
- # of Neutrons = 45
- # of Electrons = 35

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💡 Key Tips:

- Always round atomic mass to the nearest whole number to find neutrons.
- In neutral atoms: protons = electrons.
- The atomic number defines the element.

Let me know if you'd like this as a printable PDF or need explanations for any part!