Atoms and Atomic Theory

Front

What varies between isotopes of an element?

Back

Neutrons and atomic mass.

Front

What did J.J. Thomson discover about atoms?

Back

Atoms contain negatively charged particles.

Front

What did Niels Bohr suggest about electrons?

Back

Electrons are found in specific orbits.

Front

What is the mass number of an atom?

Back

The mass number is the sum of protons and neutrons.

Front

What particle is found in the nucleus and has no charge?

Back

Neutron.

Front

What is an atom?

Back

The smallest unit of an element that retains its properties.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.