Fretest

Which scientist discovered the electrons?

• Dalton

• Thomson

• Atristotle

• Bohr

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

What is a particle with one negative charge called?

• electron

• proton

• quark

• neutron

The smallest particle of an element that still represents that element.

• Nucleus

• electron

• proton

• atom

What is a particle with one positive charge called?

• proton

• electron

• neutron

• quark

What is the center of an atom called?

• nucleus

• electron cloud

• proton center

• photon center

What is the neutral particle found in the nucleus called?

• proton

• neutron

• electron

• quark

All matter is made of

• energy

• atoms

• electrons

• compounds

Matter always has mass.

• true
• false

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

• Atoms
• Parts
• Molecules
• Hydrogen