Who first proposed the idea that everything is made up of tiny, indivisible particles?

• John Dalton

• Democritus

• J.J. Thompson

• Ernest Rutherford

What did John Dalton describe atoms as?

• Solid spheres

• Plum pudding

• Compact nucleus

• Orbiting electrons

Which model suggested that atoms are a ball of positive charge with electrons stuck in it?

• Planetary model

• Plum pudding model

• Solid sphere model

• Nuclear model

What did Rutherford's gold foil experiment demonstrate?

• Atoms have a compact nucleus

• Atoms are a ball of positive charge

• Electrons orbit the nucleus

• Atoms are solid spheres

Tags

NGSS.HS-PS1-8

What was the major flaw in Rutherford's nuclear model?

• Electrons were not discovered

• Atoms should collapse

• Protons were not discovered

• Atoms are indivisible

Who proposed that electrons orbit the nucleus like planets around the sun?

• John Dalton

• J.J. Thompson

• Niels Bohr

• Ernest Rutherford

What prevents the atom from collapsing according to Bohr's model?

• Plum pudding

• Compact nucleus

• Solid spheres

• Electron shells

What did Rutherford discover about the positive charge in the nucleus?

• It is made up of electrons

• It is made up of neutrons

• It is made up of protons

• It is spread out

Tags

NGSS.HS-PS1-8

Who provided evidence for the existence of neutrons?

• John Dalton

• J.J. Thompson

• Ernest Rutherford

• James Chadwick

What are the neutral particles in the nucleus called?

• Neutrons

• Electrons

• Protons

• Alpha particles

Tags

NGSS.HS-PS1-8