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Question

The mass of one helium atom is


A

2amu

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B

3amu

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C

4amu

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D

8amu

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Solution

The correct option is C

4amu


Explanation for correct option:

(c) 4amu

Step 1: Finding the entities given.

We know that in Helium

  • number of proton = 2
  • number of neutron = 2

Step 2: Finding the mass of 1 helium atom

  • Hence, mass of 1 helium atom becomes 2+2=4amu
  • Hence this option is correct

Explanation for incorrect options:

Since, the mass of one helium atom is 4amu. Therefore, options (a), (b) and (d) are incorrect.

Hence the correct option is (c ) 4amu


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