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CHEM 122 General Chemistry II - Exam 1

Terms in this set (29)

formula for frequency
speed/wavelength
formula for wavelength
speed/frequency
formula for energy of a photon
E=hv or h*c/𝝀
order of quantum numbers
n, l, ml, ms
first quantum number
principal quantum number(n)
second quantum number
angular momentum quantum number(l)
third quantum number
magnetic quantum number (ml)
fourth quantum number
magnetic spin quantum number(ms)
principle quantum number
describes energy and size. (n=any positive integer)
angular momentum quantum number
describes shape. (n-1. can be zero.)
magnetic quantum number
describes orientation. (-l to +l)
magnetic spin quantum number
describes spin of electron. (-1/2 or
+1/2)
Who organized the periodic table?
D. Mendeleev
How is the periodic table organized?
by increasing atomic number (atomic mass).
Irregular Electron Configurations
Cr, Cu, Mo, W, Ag, Au, Ru, Pd
Pauli Exclusion Principle
no two electrons in the same atom can have the same set of four quantum numbers.
Aufbau Principle
An electron occupies the lowest-energy orbital that can receive it
Hund's Rule
Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron.
Valence electrons
Electrons on the outermost energy level of an atom
Core electrons
The electrons in the inner shells of an atom; these electrons are not involved in forming bonds.
periodic law
when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
paramagnetic
unpaired electrons (attracted to magnets)
diamagnetic
all electrons are paired (repels magnets)
Atomic Radii Trend
increases down and to the left
ionization energy trend
increases up and to the right
electron affinity trend
increases to the right and up
metallic character trend
increases to the left and down
electronegativity trend
increases up and to the right
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