AQA Atomic Structure (9-1)

Front

What are the three main subatomic particles of an atom?

Back

Protons, Neutrons, Electrons.

Front

What charge does a proton carry?

Back

Positive (+) charge.

Front

What charge does a neutron carry?

Back

No charge (neutral).

Front

What charge does an electron carry?

Back

Negative (-) charge.

Front

Who proposed the 'plum pudding model' of the atom?

Back

Joseph Thomson.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the atomic mass of an atom?

Back

The weighted average mass of an atom's isotopes, typically measured in atomic mass units (amu).

Front

Who discovered the nucleus of the atom?

Back

Ernest Rutherford.

Front

What is the role of electrons in an atom?

Back

Electrons are involved in chemical bonding and reactions.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a net charge due to the loss or gain of electrons.