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The atomic numbers of three elements A,B...

The atomic numbers of three elements `A,B` and `C` are given below:
Element Atomic
`A 3`
`B 9`
`C 11`
Giving reasons state, which two elements will show similar chemical properties.

Text Solution

Verified by Experts

Let us first write down the electron configurations of these three elements:

We know that the elements having the same number of valence electrons (which belong to the same group of the periodic table), show similar chemical properties. Here, the elemens `A` and `C` will show similar chemical properties becuae their atoms contasin the same number of valence electrons (1 valence electron each) in their atoms.
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