Atoms and atomic structure

Atoms and atomic structure

1. Structure of atom

   • Particles atoms made of
     • Proton
     • Neutron
     • Electron
     • Since they make up the atom, protons, neutrons and electrons are often called sub-atomic particles.
   • Atoms are the smallest particles of matter, that we cannot break down further by chemical means.

2. Atomic number, mass number, relative atomic mass

   • Atomic number
     • The number of protons in an atom is called its atomic number or proton number.
   • Mass number
     • The total number of protons and neutrons in an atom is called its nucleon number.
   • Relative atomic mass number
     • The sum of the protons and neutrons in an atom’s nucleus is the mass number.

3. Electronic arrangement

4. Isotopes

   • Isotopes are atoms of the same element, with different numbers of neutrons.

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