Atomic Structure and Periodic Table

Front

What is the basic unit of matter?

Back

The atom is the basic unit of matter.

Front

What are the three main subatomic particles in an atom?

Back

Protons, neutrons, and electrons.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

Who created the first periodic table?

Back

Dmitri Mendeleev is credited with creating the first periodic table.

Front

What determines the chemical properties of an element?

Back

The chemical properties of an element are determined by its electron configuration.

Front

What is the atomic number of an element?

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 group in the periodic table?

Back

A group is a vertical column in the periodic table, and elements in the same group have similar chemical properties.

Front

What is a period in the periodic table?

Back

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

Front

What is the mass number of an atom?

Back

The mass number is the sum of protons and neutrons in the nucleus of an atom.

Front

What is a valence electron?

Back

A valence electron is an electron in the outermost shell of an atom that is involved in forming chemical bonds.