history of atom and subatomic particles

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 charge does a proton have?

Back

A proton has a positive charge.

Front

What charge does a neutron have?

Back

A neutron has no charge (it is neutral).

Front

What charge does an electron have?

Back

An electron has a negative charge.

Front

What is the nucleus of an atom?

Back

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

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

Who proposed the atomic theory?

Back

John Dalton proposed the atomic theory in the early 19th century.

Front

What did John Dalton state about atoms of the same element?

Back

John Dalton stated that all atoms of the same element are identical.

Front

What is the role of electrons in an atom?

Back

Electrons are responsible for chemical bonding and reactions.