BASIC CHEMISTRY - BASIC CHEMISTRY We are going to begin by...

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BASIC CHEMISTRY: We are going to begin by using a reductionist approach. Scale of Nature: What are the sizes of biologically important structures Log Scale Solubility (DEMO) "Like dissolves Like" ATOMS : - Smallest unit of matter separable by normal chemical means. - Smallest unit of an element, that retains all of the elements properties. SUBATOMIC PARTICLES An atom is composed of many smaller particles. particle mass electric charge proton mass: 1 dalton, charge +1 neutron mass: l Dalton, charge 0 electron mass: ~0 daltons, charge -1 Atomic number and mass: - atomic number = the number or protons in an atom - Atomic mass = the number protons and neutrons in an atoms (approximately) Isotopes—atoms that have a different number of neutrons, so their mass is different Atomic Structure : protons and neutrons in the nucleus, electrons in the outer shells Bohr Model This model has electrons moving in orbitals or shells around the nucleus. The electrons always try to be in the lowest orbital or energy shell (that is closest to the nucleus).
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