Front

What is the basic unit of matter?

Back

An atom is the basic unit of matter, consisting of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

Front

Who proposed that atoms are indivisible?

Back

John Dalton proposed that atoms are indivisible.

Front

What subatomic particle has a negative charge?

Back

An electron has a negative charge.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron through his cathode ray tube experiment.

Front

What model of the atom did Ernest Rutherford propose?

Back

Rutherford proposed the nuclear model of the atom, which includes a dense nucleus surrounded by electrons.

Tags

NGSS.HS-PS1-8

Front

What is the current model of the atom based on quantum mechanics?

Back

The current model of the atom is based on quantum mechanics and was developed by Erwin Schrödinger.

Front

What are neutrons?

Back

Neutrons are subatomic particles found in the nucleus of an atom that have no charge.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Tags

NGSS.HS-PS1-8

Front

What is the significance of the cathode ray tube experiment?

Back

The cathode ray tube experiment led to the discovery of the electron and provided evidence for the existence of subatomic particles.