Answer to Question #160091 in General Chemistry for John

Question

Research and tabulate values of first ionisation energy for the elements in groups 1 and 2 of the periodic table.

(f) Plot graphs of first ionisation energy of the elements of groups 1 and 2 on the same axis.

(g) Explain the trend observed in the graphs in (f).

Answer 1

Ionisation energy is that energy which is required to remove the electron from atom valence shell.

As the size of atom increases ionisation energy decreases.

we know that as we go from top to down in the graph size of atom increase and in period from left to right size decreases and ionisation energy increases.

Order is Cs<Rb<K<Na<Li

2$^n^d$ grouop=Ba<Sr<Ca<Mg<Be