Question

An element X is in the $1^{st}$ group of the modern periodic table. Its ion will be represented as:

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

Answer 1

The correct option is A

$X^{+}$

The elements in the $1^{st}$ group of the periodic table have only one valence electron. Thus, they will tend to lose only one electron to gain the the nearest noble gas configuration.

So, valency of the elements in the $1^{st}$ group of the modern periodic table is 1 and they will lose one electron to form unipositively charged ion, $\left(A^{+}\right)$.