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11 Cards in this Set

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Atomic number
# of p+ (left subscript); atomic weight = # of p+ + n (left superscript)
Isotopes
have different #s of neutrons, but same # of protons
Electrons
orbit around a nucleus like planets around a star. There are different shells, or energy levels,in which electrons move.
Outermost shell (aka valence shell)
prefers to be full → more stable atom
An atom is composed of
nucleus w/ protons and neutrons; electrons that move around the nucleus
Covalent bonds
Are usually polar.
Relatively weak bond formed between atoms,made by sharing electrons.
Ionic bonds
Strong molecular bond, formed beteen atoms with opposite charges
Hydrogen bonds
Weak bond formed by electrical attraction between molecules
Water has six ‘life‐sustaining’ properties
1. liquid at RT
2. great solvent
3. cohesive and adhesive (‘sticky’)
4. high specific heat
5. high heat of vaporization
6. solid water (ice) floats
what is the pH in your stomach? in your blood?
7,3
Name the structure