History of the Atom

Front

What is the center of an atom called?

Back

Nucleus

Front

Which scientist discovered the electrons?

Back

Thomson

Front

Which of the following is NOT a part of Dalton's atomic theory?

Back

Atoms are always in motion.

Front

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

Back

Atoms

Front

Bohr discovered that electrons are located in __________.

Back

circular orbits around the nucleus.

Front

What is Dalton's Atomic Theory?

Back

A theory that states all matter is made of atoms, which are indivisible and indestructible.

Front

What did J.J. Thomson discover?

Back

The electron, using the cathode ray tube experiment.

Front

What is the electron cloud?

Back

The region around the nucleus where electrons are likely to be found.

Front

What did Ernest Rutherford discover about the atom?

Back

The nucleus is small, dense, and positively charged.

Front

What is the charge of a proton?

Back

Positive.