Q.

Elements X and Y have valence shell electronic configuration as, X, ns2 np5 ; Y : ns1Which compound is likely to be formed from X and Y ?

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a

X3Y5

b

Y3X5

c

XY

d

YX

answer is D.

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Detailed Solution

X:ns2np5 (electronegative element)  Valency =−1Y:ns1 (electropositive alkali metal)  Valency =+1Y⟶Y++e−Y+X+e−⟶X−X−have inert gas configuration Thus, compound is YX.
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