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Chemistry

Across
Two or more atoms joined by a chemical bond
Part of an atom with a neutral electrical charge
Numerical measurement that indicates the acidity or alkalinity of a water based substance
Used by the body to store energy
Compounds that join together in chains to form proteins. Cannot be made by the human body-must be acquired by diet
Part of an atom with a negative electrical charge
Substance with negatively charged ions
Created by chemically uniting two different elements
Fats that fill intercellular space; also called intercellular cement
Down
Help the body construct and renew itself
An unstable atom
Basic, pure substances that can't be broken into simpler substances
A substance loses an electron and oxygen is acquired
Substance with positively charged ions
Part of an atom with a positive electrical charge
The smallest, complete unit of an element