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

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^5b. 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?

Which group on the periodic table is generally the least reactive under standard conditions?

In the periodic table, Group 17 elements are the halogens. Which element is the most reactive (most active) halogen?

What are the horizontal rows on the periodic table called?

In the periodic table, what is a horizontal row called?