4. Atoms and Elements

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

In the periodic table, a horizontal row is called a(n):

In the periodic table, the horizontal rows are called what?

In the periodic table, the horizontal rows are called what?