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what is an atom
an atom is the smallest particle that can still have the chemical characteristics of an element
what is an ion
an ion is the particle formed when an atom or group of atoms gains or loses electrons, but the number of protons and neutrons remains the same
what is an isotope
isotopes are atoms of the same element that have the same proton (atomic) number but different number of neutrons.
they undergo the same kind of chemical reactions but may have different physical properties (eg diff boiling and melting point)
what are noble gases
have full valence electron shells
group 18th of the periodic table
chemically unreactive
monoatomic - exist as single atoms
