11 protons ,11 electrons,12 neutrons are present in an atom.The mass number and valency of that element are (L-I)
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the mass number is number of protons + nuetrons
the answer is 23..
the atom is sodium and it's valency is +1.
I HOPE I HELPED YOU....
the answer is 23..
the atom is sodium and it's valency is +1.
I HOPE I HELPED YOU....
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