science glossary terms

An ion is a positively or negatively charged atom or group of atoms

chemical bonds are the links that hold atoms together

• compounds that consist of 2 or more elements that are chemically linked together.
• ionic bond : a chemical bond that forms between oppositely charged ions.

A compound that forms when one or more valence electrons is transferred from one atom to another.

An ionic bond forms between 2 ions, forming a neutral compound.

• Ionic compounds tend to be very strong requiring large amounts of energy to break.
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• most ionic compounds exist in a solid arrangement called crystal lattice (regular repeating pattern of ions)

many ionic compounds are soluble in water

good conductors of electricity when melted or dissolved in water.

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• A chemical bond in which two atoms share one or more pairs of electrons

• A molecule is the smallest unit of a pure substance that has two or more atoms covalently bonded.
• Not all molecules are compounds because compounds are made up or 2 or more different elements
• Ex. oxygen is a molecule but not a compound.

• (ex. H₂O)
• A compound with particles made up of atoms held together by covalent bonds