Question

for the electronic configuration given, choose the electronic configuration of the element that would match its chemical properties. select the single best answer. 1s²2s²2p⁶3s¹
o 1s²2s²2p⁶3s²3p⁶4s²3d⁷
o 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶
o 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s¹
o 1s²2s²2p⁴

Explanation:

Elements with the same number of valence electrons have similar chemical properties. The given configuration $1s^{2}2s^{2}2p^{6}3s^{1}$ has 1 valence electron in the 3s - orbital. The configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}$ also has 1 valence electron in the 6s - orbital.

Answer:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}$