The helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
Atom:
Helium:
Therefore, the number of neutrons is 2.
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
An atom has mass number A and atomic number Z.
How many neutrons are present in its nucleus?
Helium atom has an atomic mass of 4 units and 2 protons in its nucleus. How many neutrons are present in its nucleus?
An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?