Atomic Theory Development

Which part of the atomic theory did JJ Thomson discover?

• there are electrons

• electrons are in energy levels

• there is a nucleus

• cathode ray tube

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

• All elements are made up of tiny indivisible particles called atoms.

• The atoms of one element are different from the atoms of another element.

• Atoms of different elements chemically combine to form chemical compounds.

• During chemical reactions, atoms are rearranged.

JJ Thomson came up with which model for the atom?

• planetary model

• electron cloud model

• plum pudding model

• nuclear model

After Rutherford discovered the nucleus, which model is believed to be true?

• protons, neutrons, and electrons are evenly distributed

• the nucleus is made of protons, neutrons, and electrons

• the nucleus is made of protons and electrons

• the model is mostly empty space with a central nucleus

Which particles form the nucleus of the atom?

• protons and electrons

• protons and neutrons

• electrons and ions

• electrons and neutrons

Which model describes electrons as orbiting a certain distance from the nucleus and either radiate or absorb energy when jumping orbitals.

• Dalton

• Thomson

• Rutherford

• Bohr

The atom is mostly large empty space with a small, dense nucleus at the center

• Dalton

• Thomson

• Rutherford

• Bohr

Atom is a positively charged cloud with embedded negative electrons

• Dalton

• Thomson

• Rutherford

• Bohr

Atoms are indivisible (cannot be broken down)

• Dalton

• Thomson

• Rutherford

• Bohr

What scientist proposed this atomic model?

• Dalton

• Thomson

• Rutherford

• Bohr