Which of the following configurations represent the elemnet in the ground and which in the excited state ? Name the element in each case :
(i) `1s^(2) 2s^(1) 2p^(1)` (ii) `1s^(2) 2s^(2) 2p^(1) 2p^(1)` (ii) `1s^(2) 2s^(2) 2p^(1)` (iii) `1s^(2)2s^(1) 2p_(x)^(1) 2p_(y)^(1) 2p_(z)^(1)` (iv) `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p_(x)^(1)3p_(y)^(1)3p_(z)^(1) 3d^(1)`

Explanation

To solve the question regarding the electron configurations and determine which represent the ground state and which represent the excited state, we will analyze each configuration step by step.

### Step-by-Step Solution:

1. **Configuration (i): `1s^(2) 2s^(1) 2p^(1)`**
- In the ground state, the electron filling follows the order: 1s (2 electrons), 2s (2 electrons), and then 2p (up to 6 electrons).
- Here, we have 2 electrons in 1s, 1 electron in 2s, and 1 electron in 2p.
- This configuration indicates that one electron from the 2s subshell has been excited to the 2p subshell.
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