Year 9 Science - Atomic Structure

Flashcards about atomic structure, subatomic particles, atomic number, and mass number based on Year 9 Science lecture notes.

What are the 3 subatomic particles that make up an atom?

Protons, neutrons, and electrons

What is the cluster of subatomic particles called at the centre of the atom?

Nucleus

Are all substances made of atoms?

Yes, all substances are made of atoms.

What are atoms?

Fundamental building block of all materials; everything in the universe is made up of them.

What are the subatomic particles that make up an atom?

Protons, neutrons, and electrons.

What particles make up the nucleus of an atom?

The protons and neutrons form a cluster in the centre of the atom.

What are the characteristics of a neutron?

Neutral charge (0), Weighs 1 atomic mass unit (1 AMU)

What are the characteristics of a proton?

Positive charge (+1), Weighs one atomic mass unit (1 AMU)

What are the characteristics of an electron?

Negative charge (-1), Weighs 1/1800 AMU

What is the atomic number?

The number of protons in the atom.

What is the mass number?

The number of protons PLUS neutrons in an atom.

How do you calculate the number of neutrons, protons, and electrons?

Number of neutrons = mass number – atomic number; Number of protons = the atomic number; Number of electrons = the atomic number