The electronic configurations of five neutral atoms are given below :
`A:1s^(2)2s^(2)2p^(6)3s^(2)`
`B:1s^(2)2s^(2)2p^(6)3s^(1)`
`C:1s^(2)2s^(2)2p^(1)`
`D:1s^(2)2s^(2)2p^(3)`
`E:1s^(2)2s^(2)2p^(6)`
Write the empirical formula for the substances containing :
(i) A and D
(ii) B and D
(iii) D and D
(iv) E and E.

Explanation

To solve the question, we need to determine the empirical formulas for the combinations of atoms A, B, C, D, and E based on their electronic configurations. We will find the valency of each atom and then use that information to write the empirical formulas.

### Step-by-Step Solution:

1. **Identify the Atoms and Their Valencies:**
- **Atom A:** `1s² 2s² 2p⁶ 3s²`
- Valence Electrons = 2 (from 3s²)
- Valency = 2
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