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Helium atom has an atomic mass …

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

Posted by Ayush Bhati 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.

Mass of atom =Protons +Neutrons

Since helium atom has a atomic mass of 4 u and it has two protons. Two protons contribute 2 u to atomic mass.

4u =2u +Neutrons

Neutrons =4-2 =2

Hence, it must contain 2 neutrons.

2Thank You

ANSWER

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