atoms and compounds
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what is group 1 called
alkali metals
what is group 2 called
the transition metals
what is group 7 called
halogens
what is group 8 called
noble gases
what is a shared propery of the alkali metals
stored under oil (out of air contact) - extremley reactive- react violentley with water to produce alkaline solution
what is an isotope
same atomic number (protons) different mass number (nuetrons)
what is the atomic number
number of protons (=no. of electrons)
what is the relative atomic mass?
the average mass of all isoptopes
what is the mass number
no. of protons + nuetrons
what is nuclide notation
shows element symbol with mass number (top) and atomic number (bottom) -can also show ion charge
what is a period (periotic table)
a row (left to right)
what is a group
a cloumn
how do you figure out a molecular formula when given the elements
symbol valency swap divide