Atomic Structure

Front

What is the atomic number of an element?

Back

The atomic number of an element equals the number of protons in an atom of that element.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the mass number of an atom?

Back

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

Front

How many protons does an aluminum atom have?

Back

An aluminum atom has 13 protons.

Front

What is the charge of a neutron?

Back

Neutrons have no charge; they are neutral.

Front

What is the charge of a proton?

Back

Protons have a positive charge.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

What is the nucleus of an atom?

Back

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

Front

What is an isotope?

Back

Isotopes are atoms of the same element with different numbers of neutrons.

Front

What is the relationship between mass number and isotopes?

Back

Different isotopes of an element have the same atomic number but different mass numbers.