Reading the Periodic Table:
1. Explain why elements in a group have similar properties.
2. Identify the four blocks of the periodic table.
group family period alkali metal alkaline earth metal halogen noble gas metal nonmetal semimetal valence electron abbreviated electron configuration noble gas inner core
The Periodic Table:
Our current periodic table lists 109 elements. It is arranged according to the periodic law:
Labeling and Naming:
There are currently 3 numbering schemes used in chemistry for the ordering of groups.
Exception - Hydrogen can be better placed in group 7A. Although, some books place it in both.
Metals & Non-metals:
Metals include the areas shaded light blue and include the families 1A & 2A. They share many characteristics.
Non-metals are shaded light red in most periodic tables and form a diagonal from C-6 to Rn-86 and include all the elements of that corner including H. They share some of these characteristics.
Semimetals or metalloids are shaded light light purple in most periodic tables form a diagonal from B-5 to At-85 and include all the elements Ge-32 and Sb-51. They share some of these characteristics.
As you learned earlier, the number of protons in an atom is equal to the number of electrons in the atom if it is neutral. The periodic table allows you to predict the bonding of an atom by allowing you to see the number of electrons in the valence orbital. The valence orbital is the highest, outermost orbital of the atom and is the only one involved in the bonding of the atom. Here are some hints for predicting valence electrons:
To save space on electron configuration notation you can use the abbreviated notation by listing the inner gas core and then the valence electrons.
Last modified: October 20, 2002