Ali chem

Period table is based on increasing

• atomic number

• atomic mass

• protons

• neutrons

Number of periods in periodic table are

• 5

• 6

• 7

• 8

B group elements are called--------metals

• alkali

• alkaline

• transition

• none

Group 7 elements are called

• noble gases

• halogens

• alkali metals

• none

Group 2A elements are called

• noble gases

• alkali metals

• halogens

• none

Group 8A elements are called

• noble gases

• halogens

• alkali metals

• none

Group 1A elements are called ------

• alkali metals

• noble gases

• halogens

• none

 $Cl_{17\ }$  lies in period

• 1

• 2

• 3

• 4

 $Mg_{12}$  is in period

• 1

• 2

• 3

• 4

 $Ar_{18}$  is in---------group?

• 4

• 7

• 6

• none of these