1. The horizontal rows of the periodic table are called PERIODS.

2. The vertical columns of the periodic table are called GROUPS, or FAMILIES. The elements in any group of the periodic table have similar physical and chemical properties!

3. Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties.

4. Alkali Metals

5. Alkaline Earth Metals

6. Transition Metals

7. InnerTransition Metals These elements are also called the rare-earth elements.

8. Halogens

9. Noble Gases

10. The s and p block elements are called REPRESENTATIVE ELEMENTS.

11. The periodic table is the most important tool in the chemist’s toolbox!

12. Atomic size (radius), Ionic size (radius), Ionization energy, Electronegativity m.p. and b.p. You must know the following periodic trends and the reasons behind them: