Sodium (Na) requires the least amount of energy to remove the most loosely held electron from a gaseous atom in the ground state.
Why sodium requires least amount of energy to remove most loosely electrons?
One electron only makes up the outermost shell of sodium as its electronic configuration of sodium is 2,8,1. While bromine has seven electrons and calcium has two. Silver is also typically the least reactive. As a result, sodium is the element that can lose one electron with the least amount of energy.
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