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How do valence electrons participate in the formation of chemical bonds?

They are found in the nucleus and attract other atoms.

They are only involved in physical changes.

They are the innermost electrons and provide stability.

They are the outermost electrons that are gained, lost, or shared.

The H-N-H bond angle in ammonia is:

109.5^o.

180^o.

104.5^o.

107^o.

Which statement best describes a crystal?

A liquid that has been frozen.

Any solid substance.

A solid with an orderly, repeating arrangement of particles.

A solid where particles are randomly arranged.

The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve how many electrons in their outermost shell?

Which statement about the stability of chemical bonds is true?

Atoms bond randomly without a specific goal.

Atoms bond to increase their energy.

Atoms bond to become less stable.

Atoms bond to achieve a more stable, lower energy state.