Atoms Isotopes and Ions

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.

Front

What are isotopes?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

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

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons).

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number?

Back

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

Front

What subatomic particle has a positive charge?

Back

The proton is the subatomic particle that has a positive charge.

Front

What subatomic particle has no charge?

Back

The neutron is the subatomic particle that has no charge.

Front

What subatomic particle has a negative charge?

Back

The electron is the subatomic particle that has a negative charge.

Front

How many protons does the isotope 89Kr have?

Back

The isotope 89Kr has 36 protons.