Atomic Theory Exam

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What does a Lewis dot diagram represent?

Back

A Lewis dot diagram represents the valence electrons of an atom and how they are arranged in bonds with other atoms.

Front

What are valence electrons?

Back

Valence electrons are the electrons located in the outermost shell of an atom and are responsible for the atom's reactivity.

Front

What did Niels Bohr prove about electrons?

Back

Niels Bohr proved that electrons exist in specific energy levels around the nucleus of an atom.

Front

Who proposed that atoms orbit the nucleus in specific orbits?

Back

Niels Bohr proposed that atoms orbit the nucleus in specific orbits.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What are subatomic particles?

Back

Subatomic particles are the particles that make up an atom, including protons, neutrons, and electrons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.