Question

An element has atomic number $13$. Which of the following statements related to this element is wrong?

• A. The atom has $13$ protons.
• B. The element is placed in the third period of the periodic table.
• C. The element is placed in group $IV$ in the periodic table.
• D. The formula of its oxide is $X_2{O}_2$.

Answer 1

Answer: (C), (D)

The correct options are
C The element is placed in group $IV$ in the periodic table.
D The formula of its oxide is $X_2{O}_2$.

Elements with atomic number = 13 has 13 protons and 13 electrons.

After atomic number 10, $3^{rd}$ periods starts.

The configuration of element is : (2,8,3). So it belongs to group $III$

The valency of compound is 3. So the formula of oxide should be $X_2{O}_3$.