Elements of group 1 are given below with their atomic number: Li (3)� – InterviewSolution

1.

Elements of group 1 are given below with their atomic number: Li (3) Na (11) K (19) (a) Give the order of their Atomic size. (b) Reactivity.

Answer»

Group 1	Atomic Number	Electronic Configuration
Li	3	2,1
Na	11	2,8,1
K	19	2, 8, 8,1

(a) The atomic size goes on increasing as new shell is added in each element as we move from top to bottom. So it is Li <Na<K.

(b) The reactivity increases as it is easy to lose electrons if the size of atom increases, the nuclear force decreases.

The reactivity order is Li < Na < K.

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