Atoms and Isotopes

Front

What two particles determine the mass number?

Back

Protons and neutrons.

Front

Calcium has the atomic number 20. If it has a mass number of 46, how many neutrons are present?

Back

26.

Front

Which part of an atom has a positive charge?

Back

Proton.

Front

What information would allow you to determine whether two atoms are of the same or different elements?

Back

The number of protons in their nuclei.

Front

Which part of an atom has a negative charge?

Back

Electron.

Front

What is an atom?

Back

The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

How do you calculate the mass number of an atom?

Back

Add the number of protons and neutrons.

Front

What is the charge of a neutron?

Back

Neutral (no charge).

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.