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Earth
Formed ~4.7 BYA, Life ~3.7 BYA
Matter
Anything that takes up space & has mass
Made up of the elements (Periodic Table)
Element
Substance that CAN NOT be broken down to other substances
C H O N P S
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulfur
Elements commonly found within all living organisms ~96% of living matter
Compound
Consists of 2+ elements in a fix (specific) ratio
Characteristics different from those of its elements
Ex. NaCl (salt) → Na, Highly Reactive , Cl, Deadly

Structural Formula
Atom Bonding

Molecular Formula
Abbreviation
Trace Elements
Trace Elements are rquired by an organism in minimal quantites
Ex. Iodine → Required for thyroid hormone production by the thyroid gland (Controls metabolic rate)