Answers

  • Brainly User
2015-05-07T13:56:52+05:30
Nucleus - the centre of atom made up of  proton and neutron this provides mass to the entire atom.
nucleons - the particles present inside the nucleus is known as the nucleons.


The outermost shell of an atom consisting of the valence electrons is valence shell.
Penultimate shell is the shell locate just before the valance shell..

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