Introduction to the chemistry of life (Atoms, molecules and compounds)

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Living tissues are composed of chemical building blocks

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All matter in our universe is built of particles called

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Contains only one type of atom

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Substances containing two or more types of atom combined are called

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Water is a compound containing both hydrogen and oxygen atoms.

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92 naturally occurring elements, making up living tissues, composed of only four:

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Small amounts (about 4% of body weight) of others are present, including sodium, potassium, calcium and phosphorus.

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Empty space, with a tiny central nucleus containing protons and neutrons surrounded by clouds of tiny orbiting electrons

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No electrical charge

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Positive Charge

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Negative Charge

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Atoms contain equal numbers of protons and electrons, they carry no net charge.

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Protons, Neutrons and Electrons are different in mass, Electrons are so small that their mass is negligible, but the bigger neutrons and protons carry one atomic mass unit each.

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What makes one element different from another?

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Hydrogen has only one proton per nucleus?

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