Atoms and Molecules

Front

What is a molecule?

Back

A molecule is made up of two or more atoms.

Front

How many atoms are in a water molecule?

Back

A water molecule is made up of 3 atoms (2 hydrogen and 1 oxygen).

Front

What subatomic particle has a positive charge?

Back

Proton.

Front

How much smaller are atoms compared to the width of a hair?

Back

Atoms are more than 10,000 times smaller than the width of a hair.

Front

What is the chart used to look up information about elements?

Back

Periodic Table of Elements.

Front

What are the three main subatomic particles of an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

What is the center of an atom called?

Back

The nucleus.

Front

What is the mass of a proton compared to a neutron?

Back

Protons and neutrons have approximately the same mass.

Front

What is the smallest unit of an element?

Back

An atom.