In the periodic table, what do we call the vertical columns?

Which type of element is least likely to react with other elements under normal conditions?

Which element is in the noble gas family (Group 18) on the periodic table?

Which group of elements on the periodic table is known for not reacting (or reacting only very rarely) with other elements under normal conditions?

Which of the following elements is classified as a halogen on the periodic table?

Locate aluminum in the periodic table and give its group number and period number.

Identify the group or period number described by each of the following: a. contains C, N, and O

Use the following blank periodic table to show where the elements matching the following descriptions appear.

a. Elements with the valence-shell electron configuration ns^2 np^5 b. An element whose third shell contains two p electrons c. Elements with a completely filled valence shell