BIO 105QR Lecture Notes - Lecture 2: Electron Shell, Atomic Number, Deuterium

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Bio 105 qr notes: what are living things made of, elements, atoms, bonds, water, macromolecules, matter exists in three basic states: Life is a series of chemical reactions: solid, liquid, gas. Matter is anything that has mass and takes up space. Atoms are the smallest functional unit of matter. All atoms have mass whether they are in a solid, liquid, or gaseous state. Chemical reactions: the breaking down or building up of matter: elements: the pure form of an atom. There are 92 naturally occurring elements on earth. 25 of these elements are essential to life. 4 of these make up about 96% of the weight of the human body: carbon, hydrogen, oxygen, nitrogen, atoms: are compromised of (and characterized by) subatomic particles. Designate identity, mass, charge, and the reactivity of the atom: proton (+, mass) -- nucleus, neutron (mass) -- nucleus, electron (-) outside the nucleus, travel along specific pathways around the periphery of the nucleus.

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