What is the Atomic Mass of Helium?
Last Updated :
09 Feb, 2024
Atomic Mass of Helium is ____________.
A) 6
B) 4
C) 5
D) 3
Answer: The atomic mass of Helium is 4amu. Therefore, the correct option is B.
Explanation:
Atomic Mass of any substance is the sum of the number of protons and the number of neutrons in the nucleus of that atom.
For Helium Atom,
- Number of Protons = 2
- Number of Neutrons = 2
Thus,
Atomic mass of Helium = 2+2 = 4
In absolute terms, the average atomic mass of Helium is 4.002602 u, which is the proportional mass of its two stable isotopes. The two stable isotopes of the Helium is,
- Helium-3 (2He3)
- Helium-4 (2He4)
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