Name the elements that correspond to the given electronic configurations. Write down their atomic number also. (i) `1s^(2) 2s^(2) 2p^(2)` (ii) `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(1)` (iii) `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6)`

Explanation

To solve the question, we need to identify the elements corresponding to the given electronic configurations and write down their atomic numbers. Let's break this down step by step.

### Step 1: Analyze the first electronic configuration `1s^(2) 2s^(2) 2p^(2)`

1. Count the total number of electrons:
- `1s^(2)` contributes 2 electrons
- `2s^(2)` contributes 2 electrons
- `2p^(2)` contributes 2 electrons
- Total = 2 + 2 + 2 = 6 electrons

2. The atomic number is equal to the number of electrons for neutral atoms. Thus, the atomic number is 6.

3. The element with atomic number 6 is Carbon (C).

### Conclusion for (i):
- **Element**: Carbon (C)
- **Atomic Number**: 6

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### Step 2: Analyze the second electronic configuration `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(1)`

1. Count the total number of electrons:
- `1s^(2)` contributes 2 electrons
- `2s^(2)` contributes 2 electrons
- `2p^(6)` contributes 6 electrons
- `3s^(2)` contributes 2 electrons
- `3p^(1)` contributes 1 electron
- Total = 2 + 2 + 6 + 2 + 1 = 13 electrons

2. The atomic number is 13.

3. The element with atomic number 13 is Aluminum (Al).

### Conclusion for (ii):
- **Element**: Aluminum (Al)
- **Atomic Number**: 13

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### Step 3: Analyze the third electronic configuration `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6)`

1. Count the total number of electrons:
- `1s^(2)` contributes 2 electrons
- `2s^(2)` contributes 2 electrons
- `2p^(6)` contributes 6 electrons
- `3s^(2)` contributes 2 electrons
- `3p^(6)` contributes 6 electrons
- Total = 2 + 2 + 6 + 2 + 6 = 18 electrons

2. The atomic number is 18.

3. The element with atomic number 18 is Argon (Ar).

### Conclusion for (iii):
- **Element**: Argon (Ar)
- **Atomic Number**: 18

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### Final Summary:
1. For `1s^(2) 2s^(2) 2p^(2)`: **Element**: Carbon (C), **Atomic Number**: 6
2. For `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(1)`: **Element**: Aluminum (Al), **Atomic Number**: 13
3. For `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6)`: **Element**: Argon (Ar), **Atomic Number**: 18

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