prep 2 lesson 1

The element Al (atomic number 13) is located in period number.......

• 2

• 3

• 4

• 5

The atomic number of element that follows the Mg (12) in the same group is .......

• 13

• 17

• 20

• 21

The periodic table consist of .......... period

• 8

• 10

• 5

• 7

The modern name of zero group is .....

• 18

• 8

• 13

• 11

A divalent non-metallic element is located in period number 3 ..its atomic number is

• 10

• 8

• 9

• 2