Atomic Structure

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

What does the atomic number represent?

Back

The atomic number represents the number of protons in an element.

Front

How many protons are in an atom with an atomic number of 15?

Back

15

Front

What must be true for an atom to be neutral?

Back

An atom must have the same number of protons and electrons to be neutral.

Front

What determines the identity of an element?

Back

The identity of an element is determined by the number of protons.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total number of protons and neutrons in a specific isotope.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

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 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.