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31 Oct 2021
Given information
The mass number is defined as the sum of no. of protons and no. of neutrons. No. of electrons in a neutral atom is equal to no. of protons.
Step-by-step explanation
Step 1.
Mass no. is defined as the sum of protons and neutrons.
No. of protons = 
Therefore, atomic no. = protons + neutrons = 
As this is a neutral molecule, so, it has 
charge.
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