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The electronic configuration of an atom ...

The electronic configuration of an atom is as follows `1s^(2) 2s^(2) 2p^(2)`
a) Which element's atom is it ?
b) What is the valence shell ?
c) When excited what could be the number of lone / single electrons in this atom ?
d) What is the value of principal quantum numbers of two electrons in the first box ?

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