The Periodic Table

The periodic table is a map of all the elements, organized by atomic number (number of protons). It is set up so elements with similar behavior line up together.

Groups vs Periods

• ●Groups (also called families) are the vertical columns. Elements in the same group act alike because they have the same number of outer electrons.
• ●Periods are the horizontal rows. As you move across a period, the atomic number goes up by one each step.

Big Regions

• ●Metals: on the left and middle. Shiny, conduct electricity, bendable.
• ●Nonmetals: on the upper right. Often dull and poor conductors.
• ●Noble gases: far right column. Very stable and barely react.

Periodic Trends (Plain Terms)

• ●Atomic size: atoms get bigger going down a group and smaller going across a period to the right.
• ●Reactivity: metals on the far left are very reactive; noble gases on the far right are not.