Question

Energy is required to remove electrons from a metal atom, M. Order the following ionization energy values, Ein, from smallest to largest, a) M + Ei1 > M+ +e- b) M+ + Ei2 > M2+ + e-. c) M2+ + Ei3 > M3+ + e- d) M3+ + Ei4 > M4+ +e-

Answer 1

Answer = Ei1 ( smallest ) < Ei2 < Ei3 < Ei4 ( largest )

Reason -

For first ionisation energy , we remove electron from neutral metal M . But for 2 nd Ionisation energy , electron will be removed from M+ ( electro positive metal ).

1st Ionisation energy M + Ei1 > M+. + e-

2nd Ionisation neergy M+ + Ei2 > M2+ + e-.

Since electron will have -ve charge , removal of electron from M+ will be difficult due to force of attraction between +ve M and electron and due to this ionisation energy will be high . As postive charge increase on metal , attraction force and Ionisation energy also increase .

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