Ionization energy is the energy needed to remove an electron from a gaseous element. It is the energy accompanying the reaction:
E(g) → E+(g) + e– ΔE = IE1 > 0
This is a endothermic reaction as seen by the positive change in energy. Generally, ionization energy:
– increases as you go from left to right in a period because of higher effective nuclear charge; and
– decreases as you go down a group because of increasing energy levels between the electron and the nucleus
Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? E(g) ⟶ E+(g) + e−
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