Write Separately Draw An Atomic Structure Of 4He2 Atomic no. 2 mass no. 4?
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Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since 2 + 2 = 4, we know that the mass number of the helium atom is 4.
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Mass Number.
Name Helium
Symbol He
Neutrons 2
Electrons 2
Mass Number 4
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