Unit 3 Review

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons in order to have eight electrons in their outermost shell, achieving a stable electron configuration.

Front

How do atoms complete the octet rule?

Back

They lose or gain electrons in the outermost level.

Front

What makes an element an atom (neutral) instead of an ion?

Back

When the electrons are equal to the protons.

Front

What are valence electrons?

Back

The outermost electrons involved in chemical reactions.

Front

What is a subscript in a chemical equation?

Back

A small number written after an element symbol that indicates the number of atoms of that element in a molecule.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules are involved in the reaction.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the difference between cations and anions?

Back

Cations are positively charged ions (more protons than electrons), while anions are negatively charged ions (more electrons than protons).

Front

What is the role of electrons in chemical bonding?

Back

Electrons, particularly valence electrons, are involved in forming bonds between atoms, allowing them to achieve stability.