Atoms, Ions, and Isotopes

Front

What particles determine the mass number of an atom?

Back

Protons and neutrons.

Front

What is the mass number of bromine (Br)?

Back

80.

Front

What defines isotopes of an element?

Back

Isotopes of an element have a different number of neutrons.

Front

What is the atomic number of iron (Fe)?

Back

26.

Front

What changes when an atom becomes an ion?

Back

The number of electrons changes.

Front

What is an atom?

Back

An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a net charge due to the loss or gain of electrons.

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus.

Front

What is the significance of the atomic number?

Back

The atomic number determines the identity of an element and the number of protons in its nucleus.

Front

What are cations and anions?

Back

Cations are positively charged ions (loss of electrons), while anions are negatively charged ions (gain of electrons).