Atoms and the Periodic Table

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, which reflects the structure of atoms.

Front

What is a proton?

Back

A proton is a positively charged particle found in the nucleus of an atom. The number of protons determines the element's identity.

Front

What is an electron?

Back

An electron is a negatively charged particle that orbits the nucleus of an atom. Electrons are involved in chemical bonding.

Front

What is a neutron?

Back

A neutron is a neutral particle found in the nucleus of an atom. Neutrons contribute to the atomic mass but do not affect the charge.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is defined by its number of protons.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is a group in the periodic table?

Back

A group is a vertical column in the periodic table that contains elements with similar chemical properties.

Front

What is a period in the periodic table?

Back

A period is a horizontal row in the periodic table, indicating elements with the same number of electron shells.

Front

How many electrons can the first energy level hold?

Back

The first energy level can hold up to 2 electrons.