Basic Concepts of Atoms and Elements

Front

Atoms are the smallest particle of an element.

Back

Atoms make up everything and are the building blocks of all matter.

Front

An element is the purest substance.

Back

Elements are represented by their chemical symbol.

Front

Protons have a positive charge.

Back

Neutrons have no charge, and electrons have a negative charge.

Front

Elements on the periodic table are arranged in three groups.

Back

The groups are Metals, Nonmetals, and Metalloids.

Front

The atomic number is equal to the number of protons in an atom.

Back

The number of electrons is equal to the number of protons.

Front

The number of neutrons is found by subtracting the atomic number from the atomic mass.

Back

Round the atomic mass to the nearest whole number before subtracting.

Front

Diagram of an atom showing protons, neutrons, and electrons.

Back

Protons are in the nucleus, neutrons are in the nucleus, and electrons orbit the nucleus.

Front

The smallest part of a compound

Back

Molecule

Front

Compounds are made of

Back

Two or more elements that are chemically combined

Front

Examples of common compounds

Back

Table Salt (NaCl) and Water (H₂O)