Atomic Structure

Front

What is an atom?

Back

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

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

How many protons does an atom with atomic number 15 have?

Back

15 protons.

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 an electron?

Back

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

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What does the chemical symbol represent?

Back

The chemical symbol represents the unique identifier for an element, usually one or two letters.

Front

How many electrons are in a neutral atom of carbon (atomic number 6)?

Back

6 electrons.

Front

What is the difference between atomic number and mass number?

Back

Atomic number is the number of protons, while mass number is the sum of protons and neutrons.