Question

An element ${}^{\prime }{X}^{\prime }$ has $18$ electrons in ${}^{\prime }{M}^{\prime }$ shell and $1$ electron in ${}^{\prime }{N}^{\prime }$ shell which is the valence shell.${}^{\prime }{X}^{\prime }$ belongs to:

• A. $s$ block
• B. $p$ block
• C. $d$ block
• D. Noble gases

Answer 1

The correct option is A $s$ block

Electronic configuration of $X$ is $2,8,18,1$. ${}^{\prime }{X}^{\prime }$ belongs to $s$ block and comes under $IB$ group. Other elements of this group are silver and gold. These are together called coinage metals.