Ga3+ do not have the ground state electron configuration of a noble gas.
electron configuration:
The arrangement of electrons in the atomic orbitals of an atom is called the electron configuration.
Noble gases have completely filled orbitals and belongs to group 18 which has outermost electronic configuration of ns2np6, where n is highest shell/period.
Ca2+ has an electronic configuration of [Ar]
Cl- has an electronic configuration of [Ar]
H- has an electronic configuration of [He]
Al3+ has an electronic configuration of [Ne]
Ga3+ has an electronic configuration of [Ar]d10
since, ga3+ has outermost electrons in its d subshell so, it do not have the ground state electron configuration of a noble gas.
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