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

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Solution

Given atomic mass $= 4 u$
And the number of protons $= 2$
Step 1: Formula used:
The mass of an atom is the sum of the masses of protons and neutrons present in its nucleus.
So, number of neutrons = Mass number - Number of protons = Atomic mass - Number of protons
Step 2: Putting the values in the formula:
Number of neutrons = $4 - 2 = 2$
Hence, the number of neutrons is $2$ .

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