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45 Cards in this Set

  • Front
  • Back
arranged the elements known at that time in order of > atomic mass
made the 1st useful arrangement of the know elements in a chart
revised the periodic table to be based on atomic # rather than atomic mass
law of octaves
a repetition of similar properties w/ every 8 elements
periodic law
the properties of elements are a periodic function of their atomic #
period or series
horizontal row of elements (7)
groups or family
vertical column of elements
representative elements
designed w/ A (the 8 groups that stick up)
transition elements or metals
designed w/ B (the groups in the middle of periodic table.)
inner transition metals or rare earth metals
2 series at the bottom of the periodic table.
rep elements are called this because?
they illustrate the entire range of chemical and physical properties
roman numeral
indicates the number of valence electrons in the outside energy level.
what two series make up the inner transistion elements
lanthanide (La) & actinide (Ac) series
a compound of hydrogen w/ another more electropositive element or group
IA other name?
alkali metals
characteristics of IA
they form +1 ions (means looses)
soft, silver, low melting points
IIA other name
alkaline earth metals
forms +2 ions
aluminum forms a +3 ion
vary from nonmetal to metal
metals from +
nonmetals -
forms -2 ions
VIIA other name
halogens (salt formers)
most reactive metal
most reactive nonmetal
another name for VIIIA
noble gases or inert gases
the 8 electons in the outside energy level
diatomic molecules
are molecules formed of exactly 2 atoms of the same or different chemical elements
list the 7 diatomic molecules
hydrogen H2
nitrogen N2
oxygen O2
fluorine F2
chlorine Cl2
bromine Br2
iodine I2
electron configuration
the arrangement of the electrons around the nucleus of an atom
energy level
determines the distance that the electrons are from the nucleus
determines the path or pattern the electrons travel
S sublevel
spherical-circle holds 2 electrons
P sublevel
dumbbell- looks like figure 8 on its side- holds 6
D sublevel
lobed- looks like a smile- holds 10
F sublevel
unknown- holds 14
kernel or core
represents the nucleus and inner shell electrons; symbol of atom
valence electrons
electrons found on the outermost energy level
periodic trends for atomic radii
< in series
> in group
what units are used for atomic radii
angstroms or nanometers
ionization energy
the energy required to remove an electron from an atom
electron affinity
the energy released when an electron is added to an atom
the tendency for an atom to attract shared electrons.
ionization energy formula
A + energy to A+ + E-
electron affinity
A + E- to A- + energy
give 2 factors that affect ionization energy and electron affinity
size of nuclear charge and shielding effect
what ions are associated w/ ionization energy and electron affinity
what are periodic trends for ionization energy, electon affinity, and electronegativity
all > in a series and < in a group