The Periodic Table

1. The Periodic Table Antonio & Kevin

2. History • Created by Dmitri Mendeleev • 1869 • Intent of table to illustrate trends of the elements • At point of conception had a total of 63 elements

3. Metals • The metal Classification is largest on Periodic table • Shown in green • 88 elements in total • Classifications: • Luster • Good conductors of heat and electricity • High density • High melting point • Ductile • Malleable

4. Nonmetals • 17 elements • Mostly on right side of PT, except for Hydrogen • Shown in Orange • Classifications: • No luster • Poor conductor of heat and electricity • Brittle • Not ductile • Not malleable • Low density • Low melting point

5. Metalloids • Shown on “Stair-Case” • Shown in Purple • Classifications: • Solids • Can be shiny or dull • Ductile • Malleable • Conduct heat and electricity

6. Period • Start from 1-7 going down horizontal • Each element in same period have same amount of electron shells

7. Electronegativity • Definition: Ability of an atom to attract electrons when the atom is in the compound • Elements get more electronegative when heading toward F(Fluorine) • Electronegativity values decrease from top to bottom within a group, for representative elements the values tend to increase from left to right across a period

8. Trends of Ionization • Definition: First ionization energy tends to decreases from top to bottom within a group and increase from left to right across a period • Cations are always smaller than the atoms they formed from, anions are always larger then the atoms they formed from

9. Trends of Periodic Table