Periodic Elements

What is the group number of noble gas element

• 1. 17

• 18

• 16

• 15

What is the Chemical formula of Sodium

• Al

• Mg

• Na

• K

Electronic number of chlorine is_______

What is the group number of Halogen of periodic table

• 15

• 18

• 16

• 17

What is the valency of Magnesium element

• 2

• 1

• 3

• 4