Periodic Table

Mr. SkirbstPhysical Science

Topic 14

Periodic Table

- An arrangement of elements based on a repeating pattern

Periodic Table

Dmitri Mendeleev (Russian Chemist)

Periodic Table

Dmitri Mendeleev (Russian Chemist)

- In mid 1800’s, first to arrange elements into a periodic table

Periodic Table

Dmitri Mendeleev’s Table- According to increasing atomic mass

Periodic Table

Dmitri Mendeleev’s Table- According to increasing atomic mass- Predicted element #32 “ekasilicon” (later discovered as Germanium)

Periodic TableHenry Mosley (British Scientist)

Periodic TableHenry Mosley (British Scientist)- In early 1900’s developed the

Periodic Law (elements are arranged by atomic number = # of protons)

Periodic TableElement Square:

Periodic TableColumns:- Called “groups” or “families”- Elements have similar

characteristics or properties

Periodic TableRows:- Called “periods”- Elements’ valence # increases

from left to right- (valence = # “outer” electrons)

Periodic Tablegroups

Periodic Tablehttp://www.rsc.org/education/teachers/learnnet/ptdata/table/index.htm