Terms to Learn #4 ATOMS

Front

What is the smallest unit of matter?

Back

An atom is the smallest unit of matter, made of electrons, neutrons, and protons.

Front

What is the center of the atom called?

Back

The nucleus is the center of the atom that contains protons and neutrons and has a positive charge.

Front

What organizes all known elements by their properties?

Back

The Periodic Table of Elements organizes all known elements by their physical and chemical properties.

Front

What are observable characteristics of matter called?

Back

Physical properties are characteristics of matter that can be observed with your senses.

Front

What is a pure substance made of only one kind of atom?

Back

An element is a pure substance made of only one kind of atom.

Front

What particles are found in the nucleus of an atom?

Back

The nucleus contains protons and neutrons.

Front

What is the charge of protons?

Back

Protons have a positive charge.

Front

What is the charge of electrons?

Back

Electrons have a negative charge.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is a molecule?

Back

A molecule is formed when two or more atoms bond together.