Study the table carefully and select the correct statement

Answer

D

Explanation

W is not a noble gas, it is an anion , `W^(2-)`( `:.` no. of protons = 16 and no. of electrons = 18)
X is dipositive cation , `X^(2+)`
( `:.` no. of protons = 20 and no. of electrons = 18) `Y^(4-)`
is not a cation, it is an anion , `Y^(4-)`
( `:.` no. of protons = 14, no. of electrons = 18)
U is monopositive cation , `u^(+)`
( `:.` no. of protons = 11, no. of electrons = 10)
V is a neutral element,
( `:.` no. of protons = no. of electrons).
Mass no. of U is 23 (11 + 12). Mass no. of V is 40 (20+20). Mass no. of Wis 34 (16 + 18). Mass no. of X is 39 (20 + 19). Mass no. of Y is 29 (14 + 15). Mass no. of Z is 20 (10 + 10). Therefore, Z is lightest element and V is the heaviest.