The element sodium (Na) in the periodic table requires the least amount of energy to remove the most loosely held electron.
The periodic table is the arrangement of the elements based on their physical and chemical properties.
The sodium element requires the minimum energy to eliminate the electron from its outer shell.
The sodium element has low nuclear energy and small size making the shielding effect to be negligible.
The loss of an electron from the outer shell results in the achievement of a stable configuration.
Thus, sodium requires the least energy.
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