Which of the following group 13 elements has the lowest ionization energy?
Boron
Aluminium
Gallium
Indium
The ionization energy of group 13 elements decreases down the group due to an increase in atomic size and the shielding effect of inner electrons. Boron has the highest ionization energy among group 13 elements, followed by aluminium and indium. Gallium has the lowest ionization energy among group 13 elements.
Option 1) is incorrect because boron has the highest ionization energy among group 13 elements.
Option 2) is incorrect because aluminium has a higher ionization energy than gallium.
Option 3) is incorrect because indium has higher ionization energy than gallium.