chem 1
Proton charge
positive
Electron charge
negative
Neutron charge
none
Electrons found
outside the nucleus
protons found
inside the nucleus
neutrons found
inside the nucleus
neutron mass
1 amu
electron mass
0.001 amu
proton mass
1 amu
proton job
identity
neutron job
glue - holds atom together
electron "job"
reactivity
atomic mass
protons and neutrons
atomic number
number of protons
ion
has more or less electrons that at the start
isotope
has more neutrons than at the start
neutral atom
has the same number of protons and electrons
His law: mass stays the same before and after a reaction
Dalton
He thought the only elements were water, fire, air, ether and earth
Aristotle
He thought electrons were in a plum pudding positive framework
Thompson
He shot alpha particles through and found a central nucleus
Rutherford
He found that electrons orbit the nucleus
Bohr
To find out how many neutrons an atom has you need to...
subtract the atomic number from the atomic mass
Atomic mass is found by adding what two things together
protons and neutrons
Who made the first periodic table?
Dmitri Mendeleev