Question

an atom with 3 protons and 4 neutrons will have a valency of -
1) 3
2) 7
3) 1
4) 4

Answer 1

Heyy your answer is 3)1
Electron no. =proton no.=3
So, electronic configuration 2,1 that is lithium .Hence, valency is +1

Answer 2

As we know that number of protons = number of electrons. So, there are 3 electrons. So, its electronic configuration will be K-2 L-1 From here we can figure out that the valency of that atom would be third option that is 1

Hope it helps.

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