Documents What do the numbers mean? Na 11 22.990 sodium This is the atomic number. It is the number of protons...

What do the numbers mean? Na 11 22.990 sodium This is the atomic number. It is the number of protons in a single atom of this element. It is also # of electrons. The symbol…

Documents The Periodic Table. History of Periodic Table Developed by Dmitri Mendeleev 1869 Arranged 70 known.....

The Periodic Table The Periodic Table History of Periodic Table Developed by Dmitri Mendeleev 1869 Arranged 70 known elements by increasing atomic mass Noticed a periodic…

Documents The Periodic Table Introduction Mendeleev’s Periodic Table Dmitri Mendeleev.

The Periodic Table Introduction Mendeleev’s Periodic Table Dmitri Mendeleev Mendeleev’s Table Grouped elements in columns by similar properties in order of increasing…