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

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

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

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.

The mass number of an atom is 31. The M shell of this atom contains 5 electrons. How many neutrons does this atom have?

An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon ?

An atom has mass number A and atomic number Z. How many neutrons are present in its nucleus ?

An atom has mass number A and atomic number Z.How many protons are present in the nucleus ?