Assertion: On moving down the group, ionization enthalpy decreases. Reason: With decrease in size of the atom, the force of attraction between the nucleus and valence electrons decreases.

Question

Assertion: On moving down the group, ionization enthalpy decreases. Reason: With decrease in size of the atom, the force of attraction between the nucleus and valence electrons decreases. (A) If both assertion and reason are true and reason is the correct explanation of assertion. (B) If both assertion and reason are true but reason is not the correct explanation of assertion. (C) If assertion is true but reason is false. (D) If both assertion and reason are false.

Tardigrade Admin · Accepted Answer

I.E. decreases down the group due to increase in atomic size and the outermost electron being increasingly farther from the nucleus, there is an increased shielding of the nuclear charge by the electrons in the inner levels.

Q. Assertion : On moving down the group, ionization enthalpy decreases.
Reason : With decrease in size of the atom, the force of attraction between the nucleus and valence electrons decreases.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

$I . E .$ decreases down the group due to increase in atomic size and the outermost electron being increasingly farther from the nucleus, there is an increased shielding of the nuclear charge by the electrons in the inner levels.

Q. Assertion : On moving down the group, ionization enthalpy decreases. Reason : With decrease in size of the atom, the force of attraction between the nucleus and valence electrons decreases.