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Periodic Trends

TermDefinition
Groups The vertical columns on the Periodic Table
Mosley Arranged the Periodic Table by increasing atomic number
Malleable hammer into thin sheets
Shielding inner electrons block the attraction from the nucleus
Atomic mass the mass of an atom
Representative elements s and p blocks
Atomic number Number of protons an atom has
Inner transition metals f block
Periods The horizontal rows of the Periodic Table
Nonmetals dull, brittle, and poor conductors of electricity
Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons
Semiconductors will conduct electricity at high temperatures or when certain substances are added
Ductile make into thin wire
Mendeleev Organized elements by increasing atomic mass
Alkaline earth metals Group 2 on Periodic Table
Lustrous Shiny
Alkali metals Group 1 on Periodic Table
Halogens Group 17 on Periodic Table
Transition metals d block
Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.
Noble Gases Group 18 on Periodic Table
Metals shiny, malleable, ductile, conductors of heat and electricity
Metalloids Touch the staircase and have properties of both metals and nonmetals
Atomic Radius 1/2 of the distance between the nuclei of two like atoms
Ionization Energy The amount of energy required to remove an electron from a gaseous atom
Created by: Curt
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