Matter and Atoms

Front

What is matter?

Back

Anything that has mass and takes up space.

Front

Who proposed that everything is made of tiny indivisible particles?

Back

Democritus

Front

Whose atomic theory proposed that indivisible atoms combine in whole number ratios?

Back

Dalton

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What are the three subatomic particles?

Back

Protons, neutrons, and electrons.

Front

Where are protons and neutrons located in an atom?

Back

In the nucleus.

Front

Which subatomic particle is negatively charged?

Back

Electron.

Front

What is the charge of a neutron?

Back

Neutral (no charge).

Front

What is the quantum model of the atom?

Back

A model that describes electrons as wave-like particles existing in orbitals.

Front

How do electrons behave in the quantum model?

Back

They exist in orbitals rather than fixed orbits.