Which element is proposed to have the highest third ionization energy. calcium germanium gallium potassium

Which element is proposed to have the highest third ionization energy.

		calcium
		germanium
		gallium
		potassium

Expert Solution

Ionisation energy is the energy required to remove a electron from a atom in an isolated gaseous state

Third ionization energy means the energy required to remove 3^rd valence electron

Now, Electroic configuration of

Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² and Ca²⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶

Ge = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p² and Ge²⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

Ga = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹ and Ga²⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹

K = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ and K²⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹

Since Ca²⁺ has electronic configuration equals to the noble gas configuration thus, Calcium have third highest ionisation energy.

queen_honey_blossom answered 2 years ago

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