Respuesta :

Mg2+ has the largest nuclear effective charge of the alternatives, whereas O2 has the lowest. As a result, O2 has the lowest ionisation energy.

Why does O2 have the lowest ionisation energy?

O2 has the lowest ionisation energy of any substance. The effective nuclear charge was reduced because it had more electrons in its molecular orbital. As a result, it has a low ionisation energy.

First ionisation energy normally increases as you travel left to right across a period on the periodic table. This is because when nuclear charge increases, the outermost electron becomes more tightly connected to the nucleus.

The amount of energy necessary to free the most loosely bound electrons from the outermost shell of an element's isolated gaseous atom.

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