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Chemistry

Define the terms : atomic number, mass number and electron.

Atomic Structure

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Answer

Atomic number [Z] of an element is the number of :

  • Protons - in the nucleus of an atom
  • Electrons - in the complete atom
  • Positive charges - in the nucleus of it's atom

Mass number [A] of an atom is the total number of protons and neutrons in the atom of an element.

Electron [e] is a subatomic particle revolving around the nucleus of atom having unit negative charge 1.602 x 10-19 coulombs, and mass of 9.107 x 10-28 g. It is 1⁄1837 of the mass of a hydrogen atom or proton.

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