Question

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

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

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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