Question

$A,B,C$ are three elements with the atomic number $Z-1,Z,Z+1$ respectively. $B$ is an inert gas. Predict the group of $A$ and $C$.

• A. Group 17 and group 1
• B. Group 1 and group 17
• C. Group 16 and group 17
• D. Group 1 and group 2

Answer 1

Answer: (A)

Group 17 and group 1

$ABC⟶$ elements

$(Z-1)\left(Z\right)(Z+1)⟶$ atomic number

$\downarrow$

We know, inert gas

Group $18$ elements are Noble Gas elements which are inert in nature.

So, Group no. of $A=17$

$B=18$

$C=1$