Electrons and Energy Levels

Front

What are ions?

Back

Ions are atoms with a positive or negative charge.

Front

If an atom has 3 electrons, how many protons does it have?

Back

An atom with 3 electrons has 3 protons.

Front

What determines if an atom is stable or unstable?

Back

An atom is stable if it has a full outer energy level of electrons.

Front

How many valence electrons can fit in the first energy level?

Back

The first energy level can hold 2 valence electrons.

Front

Which group on the periodic table is stable on its own?

Back

Noble Gases are stable on their own because they have all their valence electrons.

Front

What is a valence electron?

Back

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

Front

What is the maximum number of electrons in the second energy level?

Back

The second energy level can hold a maximum of 8 electrons.

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 an atom?

Back

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