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Class 10 > Learn Science > Helium atom has an atomic mass of 4u and two protons...
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Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?

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Mass number of Helium = 4 Number of protons = 2 Number of neutrons(n) = Number of Mass(A) — Number of proton (P) = 4 – 2 = 2 Thus, No. of neutrons = 2
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No. of neutrons in helium atom is 2.
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Ans is 2 Atomic mass = no. Of neutrons + protons
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Nuetron and protons are present in the atom so helium carrying mass of 4 u will have 2 nuetrons and two protons.
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Maths Trainer with 23 years of experience

A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force.
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Biochemistry Aspirant

Np+Nn=atomic mass 2+x=4 x=2
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Progressive classes.

Mass number of Helium = 4 Number of protons = 2 Number of neutrons(n) = Number of Mass(A) — Number of proton (P) = 4 -- 2 = 2 Thus, No. of neutrons = 2
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2 neutrons.
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