Periodic Table of Elements Study Guide

Front

What is a compound?

Back

A substance made of two or more kinds of atoms that have bonded or are bound together.

Front

What is the atomic number of an element?

Back

The number of protons found in one atom of an element.

Front

What does the atomic mass of an element represent?

Back

The average mass of an atom of an element, measured in atomic mass units (amu).

Front

What happens to copper pennies when they turn green?

Back

They are reacting to oxygen and acid, forming a new substance.

Front

What are the two main particles found in the nucleus of an atom?

Back

Protons and neutrons.

Front

What is the relationship between atomic number and electrons in a neutral atom?

Back

In a neutral atom, the number of electrons equals the atomic number.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the periodic table?

Back

A tabular arrangement of elements organized by increasing atomic number.

Front

What do the rows in the periodic table represent?

Back

The periods, which indicate the number of electron shells in the elements.

Front

What do the columns in the periodic table represent?

Back

The groups or families, which contain elements with similar chemical properties.