Question

There are three elements, X, Y and Z.
X: It is the smallest element with zero valency.
Y: It has four neutrons more than that of X.
Z: It has three shell and one valence electrons more than that of Y.
By using the given hints, identify elements, X, Y and Z respectively

• A. H, Cl, Si
• B. Ne, Al, S
• C. He, B, S
• D. H, N, P

Answer 1

Answer: (C)

He, B, S

X is smallest element with zero valency so it has complete the octet..possibly noble gas.so either its option {b} or {c}.
Now ,
Z: It has one shell and three valence electrons more than that of Y. whereas Y: It has four neutrons more than that of X which means Z is sulphur hence Y is boron.
Hence the correct option is {c}