Question

Atomic number of Na is 11. Number of protons, neutropns,and electrons respectively present in sodium is:

Answer 1

Atmoic no.=11
we know that atomic no. of an element = no. of protons which is = no.of electrons
therefore, no.of electrons and protons = 11
no. of neutrons = mass no. - atomic no.
we know that mass no. of sodium = 23
therefore, no. of neutrons = 23 -11
= 12

Answer 2

NA---
Atomic number--11
Protons--11
Electrons--11
Neutrons--12

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