Which of the following elements will have the | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The first ionisation energy decreases down a group as the atomic size increases and the valence electron is further from the nucleus.$Mg$ and $Ca$

Vedclass · Accepted Answer

$Rb$

Vedclass · Answer

(B) The first ionisation energy decreases down a group as the atomic size increases and the valence electron is further from the nucleus.$Mg$ and $Ca$ belong to Group $2$,while $Li$ and $Rb$ belong to Group $1$.Among the given elements,$Rb$ $(Rubidium)$ is in the $5^{th}$ period of Group $1$,making it the largest atom with the weakest attraction for its valence electron.Therefore,$Rb$ has the lowest first ionisation energy.

Which of the following elements will have the lowest first ionisation energy?

Similar Questions

Which of the following is the $CORRECT$ decreasing order of ionisation enthalpy for the given elements?

The first ionization enthalpies of $Na, Mg$ and $Si$ are respectively $496, 737$ and $786 \ kJ \ mol^{-1}$. What would be the first ionization enthalpy of $Al$ in $kJ \ mol^{-1}$?

Which of the following electronic configurations has the highest ionization enthalpy?

The correct order of first ionisation enthalpy of the given elements is:

Which of the following gaseous atoms has the highest value of $IE$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module