November 27, 2007
Reading Log: Chapter 6
The Periodic Table and Periodic Law
– 1790’s – compiled a list of 23 elements known at his time
– 1864 – English chemist proved that when elements were arranged
in increasing atomic mass, their properties repeated every eighth element.
– 1896 – German chemist with Russian partner Dmitri Mendeleev
demonstrated a connection between atomic mass and elemental properties.
shaped the first periodic table – leaving blanks where elements should go
: -1913- disapproved Mendeleev order of his periodic table. He
arranged the atoms in increasing atomic number instead of atomic mass.
Elements with similar properties are in the same row.
And so on…
: There is a periodic repetition of chemical and physical properties of the
elements whey they are arranged by increasing atomic number