Question

The element X in group 17 has 3 shells.
a) Write the sub shell electronic configuration of the element
b} Write the block and period number it belongs to
c)what will be the chemical formula of the compound formed if the element X react with y of the third
period which contains one electron in the p sub shell​

Answer 1

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a)

$1s {}^{2} \: 2s {}^{2} \: 2p {}^{6} \: 3s {}^{2} 3p {}^{5}$

b) P block, Period no. - 3 (No of shells)

c) Valency of X => - 1 ( GAIN of 1 electron to complete p subshell)

Valency of X => - 1 ( GAIN of 1 electron to complete p subshell) Valency of Y=> + 1( LOSE 1 electron to complete p subshell)

X+Y=> YX or XY (Compound)