Atoms and the Periodic Table

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

How are elements arranged in the modern periodic table?

Back

Elements are arranged by atomic number, which is the number of protons in the nucleus of an atom.

Front

What is the basic building block of matter?

Back

All matter is made of atoms.

Front

What is the smallest particle of an element?

Back

The smallest particle of an element is an atom.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is an electron?

Back

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

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.