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2014-11-19T16:11:26+08:00

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Ga Z=31

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹   -- ( -3e⁻ ) -->  1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹°  Ga ⁺³

When it becomes a ion of a metal Gallium give up at 3 electrons to make a stable configuration of byte.
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