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Question

Which of the following electron configurations represents an atom of magnesium in an excited state?


A
1s22s22p6
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B
1s22s22p63s2
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C
1s22s22p53s23p2
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D
1s22s22p63s13p1
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Solution

The correct option is D $$1s^2 2s^{2}2 p^{6}3 s^{1}3 p^1$$
$$\displaystyle 1s^2 2s^{2}2 p^{6}3 s^{1}3 p^1$$ represents an atom of magnesium in an excited state.
The ground state electronic configuration is $$\displaystyle 1s^2 2s^2 2p^6 3s^2$$. One electron is transferred from 3s to 3p level to form excited state. Mg has atomic number of 12. Thus it will have 12 electrons.

Chemistry

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