Atoms and Elements

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is an element?

Back

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

Front

What is the periodic table?

Back

The periodic table is a chart that organizes all known elements by their atomic number and properties.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a proton?

Back

A proton is a positively charged subatomic particle found in the nucleus of an atom.

Front

What is an electron?

Back

An electron is a negatively charged subatomic particle that orbits the nucleus of an atom.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom that has no charge.

Front

What are alkali metals?

Back

Alkali metals are highly reactive metals found in Group 1 of the periodic table, with one electron in their outer shell.

Front

What are halogens?

Back

Halogens are very reactive nonmetals found in Group 17 of the periodic table.

Front

What are noble gases?

Back

Noble gases are elements in Group 18 of the periodic table that are mostly unreactive due to having a full outer shell of electrons.