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Dmitri Mendeleev creator of the modern day periodic table.
Lothar Myer Created a periodic table at about the same time as Mendeleev. His work was not published in time so he does not receive credit.
Periodic law the physical and chemical properties of the elements are periodic functions of their atomic numbers.
Periodic table an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column or group.
Noble Gas a group 18 element (helium, neon, argon, krypton, xenon, and radon)
Lanthanides the 14 elements with atomic numbers from 58 to 71
Actinides the 14 elements with atomic numbers from 90 through 103
Periodicity a repeating pattern
Period a horizontal row of elements in the periodic table.
Family a vertical column of the periodic table.
Series A group of objects related by linearly varying successive differences in form or configuration
Group a vertical column of the periodic table.
s-block elements includes Groups 1 and 2. chemically reactive metals
p-block elements includes Groups 13 through 18.
d-block metals includes Groups 3 through 12
f-block metals includes the Lanthanides and the Actinides
Alkali metals elements of group 1 of the periodic table
Alkaline Earth metals elements of Group 2 of the periodic table
metal an element that is a good conductor of heat and electricity
transition metals one of the d-block elements that is a metal, with specific metallic properties
main-group or representative elements an element in the s or p-block
halogens elements in group 17(fluorine, chlorine, bromine, iodine, astatine)
atomic radius one-half the distance between the nuclei of identical atoms that are bonded together
bonding radius the distance between two atoms that have been bonded together.
ionization energy the energy required to remove one electron from a neutral atom of an element
electron affinity the energy change that occurs when an electron is acquired by a neutral atom.
valance electron an electron that is able to be lost gained or shared in the formation of chemical compounds
cation a positive ion
anion a negative ion
ion an atom or group of bonded atoms that has a positive or negative charge
atomic mass unit a unit of mass that is exactly 1/12 the mass of a carbon -12 atom or 1.660 x 10-27
nonmetal an element that is a poor conductor of heat and electricity
isotope atoms of the same element that have different masses
shielding effect Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus; also called screening effect
Created by: Tessa Elise