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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?
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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.
संबंधित प्रश्न
Compare the properties of electrons, protons and neutrons.
A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
Which subatomic particle is not present in an ordinary hydrogen atom?
Which subatomic particle was discovered by : Chadwick ?
Fill in the blank of the following statement :
If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is __________.
Name the element which does not contain any neutrons in its nucleus.
Identify the Mg2+ ion from the Fig. where, n and p represent the number of neutrons and protons respectively
The hydrogen atom does not have ______.
α, β, γ rays are during the ratio active decay ______ of an atom.
Beryllium + α – rays → Carbon + ______.
