Q. An element ‘$X$’ which occurs in the first short period has an outer electronic structure $s^{2}p^{1}$. What is the formula and acid-base character of its oxides?
A) $XO_{3}$, basic
B) $X_{2}O_{3}$, basic
C) $X_{2}O_{3}$, acidic
D) $XO_{2}$, acidic
Explanation
(c)
The outer electronic structure of ‘$X$’ is $s^{2}p^{1}$, hence, element ‘$X$’ belongs to third group. It will be non-metal because it is present in the first short period of third group. Its valency is +3 because it belongs to third group.
Hence, formula of its oxide will be $X_{2}O_{3}$. The oxide will be acidic in nature because it is oxide of non-metal.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.