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  • 13-10-2016
  • Chemistry
Answered

An element's atomic number is the

Anumber of protons in an atom's nucleus.
Bweight of the atom.
Cmass of the atom.
Dsum of the protons and neutrons in an atom.

Verified Answer :

OMAX OMAX
  • 17-10-2016

the answer is a)
because two different elements can have the same weight or the sum of protons and neutrons can be the same
but what truely differs an element from another and changes its chemistry, is the proton number

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