Atomic Theory

Which part of the atomic theory did Niels Bohr prove?

• there are electrons

• there is a nucleus

• electrons are in energy levels

• gold foil experiment

What experiment did JJ Thomson use?

• gold foil experiment

• cathode ray tube experiment

What determines the identity of the atom?

• protons

• neutrons

• electrons

• isotopes

What are atoms with the same number of protons but different numbers of neutrons?

• electrons

• protons

• neutrons

• isotopes

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

What is a particle with no charge?

• neutron

• electron

• proton

• atom

Who proposed a model with electrons moving in specific layers?

• Dalton

• Rutherford

• Bohr

• Thomson

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

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus