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Give the following a suitable word/phrase.

(a) The sub-atomic particle with negative charge and negligible mass.

(b) Protons and neutrons present in the nucleus.

(c) The electrons present in the outermost shell.

(d) Arrangement of electrons in the shells of an atom.

(e) The number of protons present in the nucleus of an atom.

(f) The sum of the number of protons and neutrons of an atom.

(g) Atoms of same element with same atomic number but a different mass number.

(h) The smallest unit of an element which takes part in a chemical reaction.

1 Answer

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(a) Neutron

(b) Mass number

(c) Valency

(d) Orbits or Valence shells

(e) Atomic number

(f) Mass number

(g) Isotopes

(h) Atom

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