Question

Helium atom has an atomic mass of 40 and two has protons
in its nuleus. How many
neutrons does it have?
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Answer 1

Answer:

Atomic mass of Helium is 4 u and Protons is 2.

So total no. of neutrons will be (4-2) =2 neutrons.

So For,

4u - 2 neutrons

40u- ?

40x2/4=20 neutrons.

Explanation:

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Answer 2

Answer:

This is your answer

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