Science!

Vocabulary

Questions from bob!

I'm very confused on the periodic table. Can you help?

Definitions!

Yes of Course! Here is some definitions! :)

Periodic Table- A Table that organizes elements based on physical and chemical properties.

Re-activity- Tendency of a substance to undergo chemical changes.

Periodic Trend- A regular pattern of characteristics along a row or column in the periodic table.

Valence Electrons- The electrons in the outer most energy level of an atom.

Chemical Groups-A horizontal row of elements on the periodic table that share chemical properties.

Chemical Periods- A horizontal row of elements on the periodic table that have the same number of energy levels.

Noble Gases- Elements in Group 18 that are nonreactive; gases at room temperature

Halogen- Elements in group 17 on the periodic table. This group tends to be mostly gases and is very reactive.

Alkali Metal- Elements in group 1 on the periodic table. This group tends to be mostly metals and is very reactive.

Alkali Earth Metal- Elements in group 2 on the periodic table. This group is made up of entirely of metals and is reactive.