Prep 2 first term

Tha properties of the element, which has atomic number =17 are similar to the element which has atomic number =.........

• 7

• 9

• 15

• 20

Tha atomic number of a metallic element which is divalent and located in the third period is...........

• 5

• 8

• 12

• 20

The number of electrons present in the ion of trivalent metallic element located in the third period is........

• 3

• 10

• 8

• 13

Element X is from alkali metals, reacts with element Y from (17), a salt is produced, whose chemical formula is............

• XY

• XY

• XY

• XY

The density of pure water in the solid state is....... 1gm/cm

• Equal to

• Less than

• More than

• No correct answer

The volume of mass of water at 30°C is........... The volume of the same mass at 1°C.

• More than

• Less than

• Equal to

• No correct answer

The upper three layers of atmospheric envelope contain......... Of water vapour

• 99%

• 25%

• 1%

• 75%

The value of atmospheric pressure may be

equal........ Mb at the top of

El- Mokattem mountain

• 1031.25

• 1016.25

• 1013.25

• 1010