Isobar - One of two or more atoms or elements having the same mass numbers but different atomic numbers, Atomic number - The number of protons in the nucleus of an atom of the element., Radon - A radioactive chemical element with the symbol Rn and atomic number 86., Niels Bohr - The inventor of the atomic theory which an atom is like a planetary model where electrons were situated in discretely energized orbits., Mass Number - The total number of protons and neutrons in a nucleus., John Dalton - The scientist who claim that Elements consist of indivisible small particles (atoms), Isotope - Any of two or more species of atoms of a chemical element with the same atomic number, Electron - A stable negatively charged component of an atom, Nucleus - Consisting of protons and neutrons,

ATOMIC STRUCTURE

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