2. Helium atom has an atorle asof 4 u and two protons in itsnucleus. H

1.	2. Helium atom has an atorle asof 4 u and two protons in itsnucleus. How many neutronsdoes it have?
Answer» Formula used: No. of Protons + No. of Neutrons = (No. of electrons) = Mass number. Mass number of He = 4No.of Protons in He = 2 Using the formula, No. of Protons + No. of Neutrons = Mass number. No. of Neutrons = Mass number - No.of Protons No. of Neutrons =4-2 = 2 Therefore,No.of Neutrons in Helium atom = 2

2. Helium atom has an atorle asof 4 u and two protons in itsnucleus. How many neutronsdoes it have?

Answer»

Formula used: No. of Protons + No. of Neutrons = (No. of electrons) = Mass number.

Mass number of He = 4No.of Protons in He = 2

Using the formula, No. of Protons + No. of Neutrons = Mass number. No. of Neutrons = Mass number - No.of Protons No. of Neutrons =4-2 = 2

Therefore,No.of Neutrons in Helium atom = 2