The metal capable of gaining as well as losing an electron is:
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- Au
As shown in image, Gold has 2 electrons in level 1, 8 electrons in level 2, 18 in level 3, 32 in level 4, 18 in level 5 and 1 electron in level 6. Gold is having 1 eletcron in last level, so it can lost 1 electron to complete their valency or it can also gain 1 electron thus 2 electron will come in outer cell and will complete the last level.
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