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प्रश्न
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
उत्तर
Atomic mass = 4u
Atomic mass = Number of neutrons + Number of protons
4 = Number of neutrons + 2
Number of neutrons = 4 − 2
Number of neutrons = 2
∴ The number of neutrons in a helium atom = 2.
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संबंधित प्रश्न
Name the three sub-atomic particles of an atom.
The mass of an electron is about `1/2000` times that of proton.
Which subatomic particle is not present in an ordinary hydrogen atom?
Which subatomic particle was discovered by : Chadwick ?
What is a neutron? State its relative mass and charge.
Isotopes exist because atoms of the same element can have different numbers of ______.
What is the charge of a neutron?
Write the properties of neutrons.
Beryllium + α – rays → Carbon + ______.
The stability of the nucleus is determined by the Neutron – Proton ratio.
