PS - The Atom

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 neutral particle found in the nucleus called?

• proton

• neutron

• electron

• quark

What is the center of an atom called?

• nucleus

• electron cloud

• proton center

• photon center

Who developed the planetary model of the atom?

• Niels Bohr

• Ernest Rutherford

• John Dalton

• Democritus

Tags

NGSS.MS-PS1-1

Democritus was known for

• discovering the electron

• discovering the proton

• creating the term atom, meaning indivisible

• discovering the nucleus

Tags

NGSS.MS-PS1-1

JJ Thomson discovered the

• nucleus

• proton

• neutron

• electron