what is a valency?
the combining power of an atom (the number of bonds a particle can form) it is also the number of electrons an atom needs to lose or gain to achieve a full outer shell of electrons
what does stable mean?
has a full outer shell of electrons
whats an ion?
atoms which have lost or gained electrons to become either positively or negatively charged
if an atom loses an electron its becomes...
if an atom gains an electron it becomes...
what is the mass number?
the sum of protons and neutrons in the nucleus of an atom
whats a molecule?
two or more non-metal atoms that are chemically joined together by covalent bonds
whats a neutron?
sub atomic particle with no charge (neutral)
whats a proton?
sub atomic particle with a positive charge
what is an element?
a substance made up of only one type of atom
whats an ionic bond?
when electrons are transferred from a metal atom to a non-metal atom and the resulting two oppositely charged ions are attracted to each other
what does diatomic mean?
two atoms joined together in a molecule
what are the 7 diatomic elements?
fluorine, chlorine, oxygen, hydrogen, nitrogen, bromine, iodine
whats an electron?
sub atomic particle with a negative charge found outside the nucleus in electron shells
whats a bond?
force of attraction between particles which holds them together
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