Atomic Theory

Front

Who claimed that matter was made of small, hard particles called 'atomos'?

Back

Democritus

Front

What are subatomic particles with a negative charge?

Back

Electrons

Front

What are subatomic particles that are neutral in charge?

Back

Neutrons

Front

What did John Dalton state about atoms?

Back

Atoms are tiny, invisible particles; Atoms of one element are all the same; Atoms of different elements are different; Compounds form by combining atoms. (All of the statements listed.)

Front

Who discovered the neutron?

Back

James Chadwick

Front

What is the basic unit of matter?

Back

Atom

Front

What are the three main subatomic particles?

Back

Protons, Neutrons, Electrons

Front

What charge do protons carry?

Back

Positive charge

Front

What is the nucleus of an atom?

Back

The central part of an atom that contains protons and neutrons.

Front

What is the mass of an electron compared to protons and neutrons?

Back

Electrons have a much smaller mass than protons and neutrons.