Atoms

Atoms

1. Electron Shells

2. Electronic Configuration

3. Properties of sub-atomic particles

4. Isotopes

   • The number of protons in the nucleus of an atom is called its atomic number: the atoms of a particular element all have the same number of protons the atoms of different elements have different numbers of protons The total number of protons and neutrons in an atom is called its mass number.

5. Relative atomic mass

   • Different atoms have different masses. Atoms have such a small mass it is more convenient to know their masses compared to each other. Carbon is taken as the standard atom and has a relative atomic mass (Ar) of 12.

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