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Out of the three elements P, Q and R having atomic numbers 11, 17 and 19 respectively which two elements will show similar properties and why ?

While giving the atomic no.  first we have to write its electronic configuration.

Element At.no - Electron shell configuration
P              11 -       1s2, 2s2, 2p6, 3s1
Q             17 -        1s2, 2s2, 2p6, 3s2, 3p5
R             19 -         1s2, 2s2, 2p6, 3s2, 3p6, 4s1
            The element P and R are similar in their outer shell e- configuration and hence they have similar physical properties.


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