Atomic Theory

Who came up with the first atomic theory?

• Dalton

• Democritus

• Thomas

• Rutherford

What did Rutherford discover about atoms?

• An atom is always negatively charged.

• An atom is mostly empty space, but has a dense positively charged center(nucleus).

• An atom is always positively charged.

• All particles will pass straight through gold foil with no change in path.

Tags

NGSS.HS-PS1-8

What is a positively charged particle?

• neutron

• electron

• proton

• atom

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

Tags

NGSS.MS-PS2-3

What is a particle with no charge?

• neutron

• electron

• proton

• atom

Tags

NGSS.HS-PS1-8

What did Rutherford discover in his experiment?

• nucleus

• electrons

• neutrons

• protons

Tags

NGSS.HS-PS1-8

Who proposed a model with electrons moving in specific orbital (planetary) layers?

• Dalton

• Rutherford

• Bohr

• Thomson

What does atom mean?

• small

• visible

• indivisible

• particle

Rutherford's "gold-foil" experiment using alpha particle scattering concluded that

• the center of the atom is empty

• atomic mass is spread over the whole atom

• the center of the atom has a negative charge

• most of the atom is empty

All of the following are true about Democritus' atomic theory EXCEPT ______.

• Everything is made up of atomos and the void.

• Atoms vary in size and shape.

• Atoms are composed of subatomic particles.

• Atoms are infinite in number.