development of the atom Flashcards
1
Q
what did john dalton do?
A
he agreed with democritus that matter was made up of tiny spheres called atoms
2
Q
what did jj thompson do?
A
discovered the electron and created the plum pudding model
3
Q
what did rutherford do?
A
alpha particle scattering, discovered the nuclear model
4
Q
what did niels bohr do?
A
stated that electrons orbit the nucleus at set distances called energy levels
5
Q
what did james chadwick do?
A
proved the existence of the neutron
6
Q
what is the plum pudding model?
A
a sphere of positive charge embedded with negative electrons
7
Q
what is the nuclear model?
A
a positively charged nucleus (where most of the mass is concentrated) surrounded by a cloud of negative electrons
8
Q
how much smaller is the nucleus than the radius of the atom?
A
10,000x
