Question

an element 13 protons ,13 electrons and 14 nuetrons. what is the atomic no. of 'X'?what is its valency?

Answer 1

atomic no.= no. of electrons = 13
its valency will be = 3

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Answer 2

Aluminium is the element. it's valency is 3+ & atomic no is 13
ie, protons= electrons = at. number.