Question

Which of the above represents the formula for the most common compound of A and B, where A and B represent given pairs of elements or polyatomic ions as indicated below?
A) $H$

B) $S$

• A. $AB$
• B. $A{B}_2$
• C. $A_{2}B$
• D. $A{B}_3$
• E. $A_2{B}_3$

Answer 1

The correct option is C $A_{2}B$

$A_{2}B$ is the correct option. Sulphur has four electrons in its 3p subshell. To complete the 3p subshell it needs two more electrons. And hence it forms two bonds with two hydrogen atoms each having one electron. Thus, $H_{2}S$ is formed.