Q. 45.0( 4 Votes )
a) Subshell electronic configuration = 1s2 2s2 2p6 3s2 3p5
b) Period number = 3
c) Chemical formula when element X reacts with element Y= YX3
Element X has 3 shells means it is the element of 3 period. So, element X is Chlorine which is the element of 3 period and 17 group.
And element Y of the third period has 3 valence electrons because there is one electron in a 3p subshell and 2 electrons are in 3s subshell because s subshell filled first than p subshell. So, the chemical formula will be YX3.
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