Assertion: Aluminium has a higher melting point than gallium and indium.
Reason: Aluminium has a higher charge density than gallium and indium.
Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
Assertion is true, but Reason is false.
Assertion is false, but Reason is true.
The electronegativity of group 13 elements decreases down the group due to the increase in atomic size, which causes a decrease in the attraction between the nucleus and the valence electrons.