Study Guide (Periodic Table and His.) Flashcards
Who attributed to the idea of arranging the known elements of his time in a table according to their chemical/physical properties?
Dmitri Mendeleev
_______ predicted that the empty spaces on his periodic table represented
undiscovered elements
Who arranged the periodic table in the order of Atomic #?
Henry Moseley
The periodic law states there is a periodic repetition of physical/chemical properties of the elements when…
they are arranged in order of increasing atomic #
name of vertical columns of the periodic table…
Groups
Each period in the periodic table corresponds to:
an energy level
Valence electrons:
electrons that are found in the outermost energy level of atoms
the horizontal rows of the periodic table are:
periods
what do elements in the same periodic group have in common
same # of valence configuration, valence electrons, and similar chemical properties
what do elements in the same period have in common
same # of occupied energy levels
how many elements are in a period in which only s and p sublevels are filled
8
sublevels in a period that contains 32 elements
s,p,d,f
(for groups 13-18) # of valence electrons is equal to:
its group # (or group # - 10)
Three classes of elements
metals, nonmetals, metalloids
(elements classes/ fams) Most reactive group of nonmetals
Halogens