Unit 2 Review: Atoms

Front

What is radioactivity?

Back

Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation. It can be used for good, such as in medical treatments and energy production.

Front

What particles are found inside the nucleus of an atom?

Back

Protons and neutrons are found inside the nucleus of an atom.

Front

Which particles have a negative charge?

Back

Electrons have a negative charge.

Front

What does the atomic number of an element represent?

Back

The atomic number of an element is the same as the number of protons in its nucleus.

Front

Why is the atomic mass of carbon (12.0107) not a whole number?

Back

The atomic mass is an average that takes into account the different isotopes of carbon and their relative abundances.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

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.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the role of electrons in an atom?

Back

Electrons are responsible for chemical bonding and reactions; they orbit the nucleus and have a negative charge.