Front

What is at the center of every atom?

Back

A nucleus.

Front

How many atoms of Hydrogen are in H₂O?

Back

2.

Front

The particles with no charge in an atom are the _______.

Back

neutrons.

Front

All matter is made of _________.

Back

atoms.

Front

What is the mass of an electron compared to a proton?

Back

Much less.

Front

What are the three main particles in an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons have?

Back

Positive charge.

Front

What charge do electrons have?

Back

Negative charge.

Front

What is the smallest unit of an element?

Back

An atom.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.