Which of the following has lowest first ionization energy?

Question

Which of the following has lowest first ionization energy? (A) H (B) He (C) Xe (D) Li

Tardigrade Admin · Accepted Answer

Ionisation energy increases as we move left to right across a period (i.e., from Li to Ne) and decreases when from top to bottom in a group. Hence, ionisation energy of lithium ( Li ) is lowest in the given elements.

Q. Which of the following has lowest first ionization energy?

H

He

Xe

Li

Ionisation energy increases as we move left to right across a period (i.e., from $L i$ to $N e$ ) and decreases when from top to bottom in a group. Hence, ionisation energy of lithium $(L i)$ is lowest in the given elements.

Q. Which of the following has lowest first ionization energy?

H

He

Xe

Li

Ionisation energy increases as we move left to right across a period (i.e., from Li to Ne) and decreases when from top to bottom in a group. Hence, ionisation energy of lithium (Li) is lowest in the given elements.

Ionisation energy increases as we move left to right across a period (i.e., from $L i$ to $N e$ ) and decreases when from top to bottom in a group. Hence, ionisation energy of lithium $(L i)$ is lowest in the given elements.