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Atoms
The smallest particles of elements
Element
A substance made og only one type of atom
Isotope
Different types of the same element C¹², C⁵
Compound
Contains 2 or more elements
HF, CO2, H2O
Covalent bond
Atoms share electric
Ionic bond
One atom gains, the other loses
Hydrogen bonds
Weak bonds between water molecules
Common substances in living systems
Water, CO2, O2, Ammoniac, Mineral Salts, Carbohydrates, Lipids, Proteins, Nucleic acid, ATP
Mineral Salts in the body
Ca+, Na+, K+, PO4- Cl-