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[" Q2) Helium atom has an atomic mass "]...

[" Q2) Helium atom has an atomic mass "],[" of "4u" and two protons in its nucleus."],[" How many neutrons does it have? "],[" (a) "1],[" (b) "2],[" (d) "4]

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Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have ?

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Helium atom has an atomic mass of 4 u and two protons in its nucleus. Howmany neutrons does it have ?

Lithium atom has atomic mass 6 and has 3 protons in it nucleus. How many neutrons does it have? Write down its electronic configuration.