Atoms Family-Atomic Structure online exercise for - Free Printable

Let's solve each element one by one using the information provided in the periodic table format. Each box contains:

- Top number: Atomic number (number of protons)
- Symbol or name: Element symbol or name
- Bottom number: Atomic mass (approximate mass of the atom, in atomic mass units)

We will use the following rules:
- Atomic number (# of protons) = Top number
- # of electrons = # of protons (in a neutral atom)
- # of neutrons = Atomic mass (rounded to nearest whole number) – Atomic number

---

1. Sulfur (S)

```
16
S
32.06
```

- Atomic # = 16
- Atomic Mass = 32.06 → rounded to 32
- # of Protons = 16
- # of Neutrons = 32 - 16 = 16
- # of Electrons = 16

✔ Answer:
Atomic #: 16
Atomic Mass: 32.06
Protons: 16
Neutrons: 16
Electrons: 16

---

2. Iodine (I)

```
53
Iodine
126.905
```

- Atomic # = 53
- Atomic Mass = 126.905 → rounded to 127
- # of Protons = 53
- # of Neutrons = 127 - 53 = 74
- # of Electrons = 53

✔ Answer:
Atomic #: 53
Atomic Mass: 126.905
Protons: 53
Neutrons: 74
Electrons: 53

---

3. Manganese (Mn)

```
25
Mn
54.938
```

- Atomic # = 25
- Atomic Mass = 54.938 → rounded to 55
- # of Protons = 25
- # of Neutrons = 55 - 25 = 30
- # of Electrons = 25

✔ Answer:
Atomic #: 25
Atomic Mass: 54.938
Protons: 25
Neutrons: 30
Electrons: 25

---

4. Magnesium (Mg)

```
12
Mg
24.305
```

- Atomic # = 12
- Atomic Mass = 24.305 → rounded to 24
- # of Protons = 12
- # of Neutrons = 24 - 12 = 12
- # of Electrons = 12

✔ Answer:
Atomic #: 12
Atomic Mass: 24.305
Protons: 12
Neutrons: 12
Electrons: 12

---

5. Argon (Ar)

```
18
Argon
39.948
```

- Atomic # = 18
- Atomic Mass = 39.948 → rounded to 40
- # of Protons = 18
- # of Neutrons = 40 - 18 = 22
- # of Electrons = 18

✔ Answer:
Atomic #: 18
Atomic Mass: 39.948
Protons: 18
Neutrons: 22
Electrons: 18

---

6. Potassium (K)

```
19
K
39.098
```

- Atomic # = 19
- Atomic Mass = 39.098 → rounded to 39
- # of Protons = 19
- # of Neutrons = 39 - 19 = 20
- # of Electrons = 19

✔ Answer:
Atomic #: 19
Atomic Mass: 39.098
Protons: 19
Neutrons: 20
Electrons: 19

---

7. Gold (Au)

```
79
Gold
196.967
```

- Atomic # = 79
- Atomic Mass = 196.967 → rounded to 197
- # of Protons = 79
- # of Neutrons = 197 - 79 = 118
- # of Electrons = 79

✔ Answer:
Atomic #: 79
Atomic Mass: 196.967
Protons: 79
Neutrons: 118
Electrons: 79

---

8. Hydrogen (H)

```
1
H
1.008
```

- Atomic # = 1
- Atomic Mass = 1.008 → rounded to 1
- # of Protons = 1
- # of Neutrons = 1 - 1 = 0 (most common isotope, protium)
- # of Electrons = 1

✔ Answer:
Atomic #: 1
Atomic Mass: 1.008
Protons: 1
Neutrons: 0
Electrons: 1

---

9. Fluorine (F)

```
9
Fluorine
18.998
```

- Atomic # = 9
- Atomic Mass = 18.998 → rounded to 19
- # of Protons = 9
- # of Neutrons = 19 - 9 = 10
- # of Electrons = 9

✔ Answer:
Atomic #: 9
Atomic Mass: 18.998
Protons: 9
Neutrons: 10
Electrons: 9

---

Final Answers Summary:

| Element | Atomic # | Atomic Mass | Protons | Neutrons | Electrons |
|--------|----------|-------------|---------|----------|-----------|
| S | 16 | 32.06 | 16 | 16 | 16 |
| I | 53 | 126.905 | 53 | 74 | 53 |
| Mn | 25 | 54.938 | 25 | 30 | 25 |
| Mg | 12 | 24.305 | 12 | 12 | 12 |
| Ar | 18 | 39.948 | 18 | 22 | 18 |
| K | 19 | 39.098 | 19 | 20 | 19 |
| Au | 79 | 196.967 | 79 | 118 | 79 |
| H | 1 | 1.008 | 1 | 0 | 1 |
| F | 9 | 18.998 | 9 | 10 | 9 |

> ✔ All values are filled based on standard atomic data and rounding atomic mass to the nearest whole number for neutron calculation.

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