An element has the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^5$. In which group of the Periodic Table is it found?

Question

Accepted Answer

Group 17. The outer shell has $3s^2 3p^5$, that is 7 valence electrons, which places the element in Group 17 (the halogens); it is chlorine. Group 18 elements have a full $p^6$ outer shell.

Answer

A) Group 18

Answer

B) Group 2

Answer

C) Group 17

Answer

D) Group 15

An element has the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^5$. In which group of the Periodic Table is it found?

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