scientists to remember

dalton and his postulates

1.) atoms small invisible

2.) atoms in an element are idenitical

3.) atoms dont change

4.) molecules form ratio

daltons laws

1.) defininte porprotion

2.) mass conservation

3.) ratio or mass ratio gives whole number

jj thompson

cathode rays - e- exists

plum pudding

milken

oil drop - charge and mass of e-

rutherford

gold foil - nuelcues and positve protons

chadwick

neutrons

mendeleev

groups by atomic mass

blanks missing

mosely

grouped by atomic number