Atomic Theory

Who came up with the first atomic theory out of the scientists below?

• Dalton

• Socrates

• 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.

What is a positively charged particle?

• neutron

• electron

• proton

• atom

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

Who discover the electron?

• Dalton

• Rutherford

• Thomson

• Bohr

What did Rutherford discover in his experiment?

• nucleus

• electrons

• neutrons

• protons

Who proposed a model with electrons moving in specific 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

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus