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14 Cards in this Set

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protons
stable, positively charged subatomic particle in the baryon family
element
one of four substances, earth, air , fire , water
atomic weight
the average mass of an atom of an element
isotope
one of two or more atoms having the same atomic number but different mass numbers
valance
the ability of a substance to interact with another or to produce an effect
periodic table
a table arrangment of the elements according to their atomic numbers so that elements with similar properties are together
reactive element
tending to participate readily in reactions
atom
a unit of matter, the smallest unit of an element
electrons
a stable subatomic particle in the lepton family
neutrons
an electrically neutral subatomic particle in teh baryon family
covalent bonding
a chemical bond formed by the sharing of one or more electrons, especially pairs of electrons, between atoms
inert (stable) element
not readiliy reactive with other elements; forming few or no chemical compounds
radioactive
of, exhibiting or caused by radioactivity
atomic number
the number of protons in an atomic nucleus