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DCE Chem Unit 3

DCE Chemistry Unit 3 Vocabulary

mole the amount of substance that contains 6.02 x 10 ^23 particles
molar mass the mass of 6.02 x 10^23 particles of a substance
period a row (going across) in the periodic table
group a column (going down) in the periodic table
metal a class of elements that are generally good conductors, ductile, malleable, and shiny
nonmetal a class of elements that are generally not good conductors, not ductile, not malleable, and not shiny
semiconductor also known as a metalloid; an element that has properties of both metals and nonmetals
valence electrons electrons that are in the highest energy level of an atom
alkali metal any metal in group 1A on the periodic table
alkaline earth metal any metal in grou 2A on the periodic table
transition metal any of the group B elements on the periodic table
halogen any nonmetal in group 7A on the periodic table
noble gas any element in group 8A on the periodic table
atomic size the size of an atom as measured by one half the distance between two joined atoms of the same element
ionization energy the energy required to remove an electron from an atom in the gaseous state
electron affinity the ability of an atom to attract an electron to itself
Periodic Law when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
Mendeleev Russian chemist and teacher who organized the elements in a table in order of increasing atomic mass
electron shielding the inner electrons of an atom repel the outer electrons, making the outer electrons feel the pull of the nucleus less
ion an atom that has lost or gained electrons
ductile able to be drawn into wire
malleable able to be hammered into flat sheets
conductive able to transfer heat or electricity through it
trend for atomic size atoms get smaller as you move across a period and larger as you move down a group
trend for ionization energy first ionization energy increases as you move across a period and decreases as you go move down a group
trend for electron affinity the amount of energy released when an atom acquires an electron and forms a negative ion; increases as you move across a period and decreases as you move down a group
Created by: dcechem