Atomic Theory & Atomic Structure

Front

Subatomic particles with a negative charge

Back

Electrons are subatomic particles that carry a negative charge and are found in the electron cloud surrounding the nucleus of an atom.

Front

Who created the Planetary Model of the atom?

Back

Niels Bohr created the Planetary Model of the atom, which depicts electrons orbiting the nucleus in defined paths.

Front

Who discovered the neutron within the atom?

Back

James Chadwick discovered the neutron, a neutral subatomic particle located in the nucleus of an atom.

Front

Who discovered the electron within the atom?

Back

J.J. Thomson discovered the electron, the first subatomic particle identified, using cathode ray experiments.

Front

What did Dalton believe about atoms of the same element?

Back

John Dalton believed that atoms of the same element are identical in mass and properties.

Front

What is the nucleus of an atom?

Back

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

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What is atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is an isotope?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the electron cloud?

Back

The electron cloud is the region around the nucleus of an atom where electrons are likely to be found.