periodic table
what is the 45th element on the periodic table?
rhodium
what did Rutherford discover?
the nucleus
what is the charge of a proton?
positive
what are the units for volume?(solid and liquid)
ml and cm3
what is the most reactive group?
alkali metals
how many neutrons does rubidium have?
49n
who was the atom discovered by?
dalton
what is the charge of a neutron?
neutral (none)
what are the units for density?(solid and liquid)
g/cm3
g/ml
what is the least reactive group?
halogens
what is the most reactive group on the periodic table?
alkali metals
what did Thomson discover?
electron
where are protons and neutrons located within an atom?
nucleus
whats the formula for finding density?
mass times volume
write two facts about alkali metals.
-highly reactive
-1+ ion charge
-group 1
-1 valence electron
how is the periodic table sorted?
groups and periods
who did the cathode ray experiment?
thomson
what are the three main subatomic particles that form an atom?
protons, electrons and neutrons
what does something have to weigh to float on water?
<1g/mL
which element is in period 3, group 2?
magnesium
what do periods tell us?
how many electron shells an element will have
who did the golden foil experiment?
rutherford
how do you determine the amount of neutrons in an element?
subtract the atomic mass from the mass number
if the density is 3.4g and volume is 5cm3 what is the mass?
0.68g/cm3
which family has a 3- ion charge?
group 15