Question

Three elements X, Y and Z have consecutive increasing proton (atomic) numbers If element X is a noble gas what will be the symbol for the ion of element Z in its compounds ?

• A. $Z^{2-}$
• B. $Z^{3-}$
• C. $Z^{2+}$
• D. $Z^{3+}$

Answer 1

The correct option is C $Z^{2+}$

X is noble gas belonging to group 18 and by increasing atomic no.Y belongs to group 1 and Z belongs to group 2 so its ion has valency two after losing two electrons it becomes a divalent cation.

Hence, the correct option is $\text{C}$