valency of an atom of 2 proton and 3 neutrons
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Helium
It is the element having atomic number 2
It is the element having atomic number 2
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Answer:
3
Explanation:
The valency of an atom is ( 8 - mass number ).
Explanation:The mass number of atoms is the total number of protons + the total number of neutrons.Hence mass number = 2+3 = 5.=Now valency of atom = 8 - mass number of that atom.Valency of atom = 8 - 5 = 3.So, the compound needs 3 electron to achieve stability
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