Question

1. Look at the elements of the third period. Classify them into metals and nonmetals.
2. On which side of the period are the metals? Left or right?
3. On which side of the period did you find the nonmetals?

Answer 1

1. Third row: Na, Mg, Al, Si, P, S, Cl, Ar

• Metals: Na, Mg, Al 
• Nonmetals: P, S, Cl, Ar

2. Left side of the period are the metals.

3. Right side of the period are the nonmetals.