The element X in group 17 has 3 shells, if so,
a) Write the subshells electronic configuration of the element.
b) Write the period number.

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Solution

1. Element X belongs to group 17 means that it has 7 valence electrons. It has 3 shells that are K, L, M. The general electron configuration is 2, 8, 7. The subshell electronic configuration is $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5} .$ [1.0 Mark]

2. As it has 3 shells that means it belongs to 3rd period. [1. 0 Mark]

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