Atoms

Front

What is an atom?

Back

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

Front

What are the three main subatomic particles in an atom?

Back

Protons, neutrons, and electrons.

Front

Where are protons located in an atom?

Back

Protons are located in the nucleus of an atom.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

How many electrons can fit in the 1st energy level of an atom?

Back

2 electrons.

Front

How many valence electrons do elements in group 2 have?

Back

2 valence electrons.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost energy level of an atom.

Front

Which group of elements is known for being stable and having a full octet of valence electrons?

Back

Group 18 (Noble gases).