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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.
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संबंधित प्रश्न
Compare the properties of electrons, protons and neutrons.
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.
Write down the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.
Calculate the number of neutrons present in the nucleus of an element X which is represented as `""_15^31"X"`
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.
The hydrogen atom does not have ______.
α, β, γ rays are during the ratio active decay ______ of an atom.
