Lec2 - This and next lectures are about chemistry Chemistry...

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This and next lectures are about chemistry emistry an be timidating but Chemistry can be intimidating, but we cannot understand human biology without aving some basic knowledge of chemistry having some basic knowledge of chemistry Try to memorize the basics, and also to nderstand understand
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2.1 Atoms and Elements Atoms are tiny particles that are building blocks of all substances and are the basic raw material of living things. Element is a pure substance consisting of just one type of atom Pure gold nugget
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Atoms Are Composed of Smaller Particles Atom (planetary model) Subatomic particles Protons: p + Electrons: e - Neutrons Attraction of opposite charges, repulsion of similar charges
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Elements Are Fundamental Forms of Matter Ninety-two natural elements (types of atoms, pure substances) Main elements of organisms Oxygen Carbon Hydrogen Nitrogen Trace elements of organisms ( e.g. Zn, Fe, Cu )
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Everything in the Biosphere, From Humans to the Earth’s Crust, is Made of Elements
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The Shell Model of Atoms inert gases
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2.3
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Lec2 - This and next lectures are about chemistry Chemistry...

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