The atomic numbers of three elements A, B and C are 3, 9 and 11 respectively. State which of the two elements will exhibit similar chemical properties.

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Solution

Let us write down the electronic configuration of these three elements:

A: 2,1
B: 2,7
C: 2,8,1

We know that the elements having the same number of valence electrons belong to the same group of the periodic table. Therefore they exhibit similar chemical properties. Here the elements A and C will show similar chemical properties because their atoms contain the same number of valence electrons (1 valence electron each).

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