CHEM 230 Midterm: Physical Chemistry E1 Review

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Atomic radius gets smaller traveling across a period. Atomic radius gets larger traveling down across a period. The effective nuclear charge increases and the protons attract the electrons closer and causes the atoms to become smaller in radius. Standard ambient temperature and pressure: (satp): 298k and 1 bar. Gas: (11) n2, o2, h2, he, f2, cl2, i2, xe, ar, ne, kr, rn. Diatomic: n2, o2, h2, br2, cl2, f2, i2. As atomic number increases = number of protons increase. Electron affinity: energy released with electron added to gas phase atom. Electron affinity increases across and up a periodic table. Ionization energy: minimum energy needed in order to remove an electron from an atom in the *gas phase*. Ionization energy increases as you go up and across a period. Atomic radius increases down a period and decreases across a period. En increases across a period and up a column. Ionic bond: electrons are completely transferred; no sharing.

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