Prep.2 unit 1 october revision

.........scientist added zero group to his table

• mendeleev

• mosely

• rutherford

• bohr

the atomic number for an element exist in group 13 period 3 is ......

• 5

• 10

• 13

• 8

the number of electron in the ion of an elements whose atomic number 13 is ....

• 3

• 10

• 13

• 8

the oxide which dissolve in water and produce an acidic solution is .......... oxide

• MgO

• CuO

• CO2

• K2O

By increasing the atomic number in periods all of the foolowing happen except

• the metallic proerty increase

• the metallic proerty decrease

• the electronegativity increase

• the atomic size decrease

the strongest metal lie in the .......group

• 1A

• 2A

• 7A

• 18

.......Rays are used in preserving food

• X- rays

• laser

• alpha

• gamma

the boilling point of liqufied nitrogen is ......

• 0

• 196

• 100

• -196

pure water boil at ......

• 0

• 100

• 120

• 200

the type of bond between water molecules are ........ bond

• single covalent

• hydrogen

• ionic

• metallic