امتحان

The atomic size of the same period decreases by the increase of their atomic numbers.

1

False

2

True

تصحيح

In Mendeleev’s periodic table Elements are arranged ascendingly acco r ding to their ….

1

atomic weights

2

Atomic size

3

Atomic shape

4

atomic numbers

تصحيح

……. discovered that the nucleus of atom contains positively charged protons

1

Rutherfo r d

2

Moseley

3

Bohr

4

Mendeleev

تصحيح

Nonmetals ………..with the acids

1

react

2

don’t react

تصحيح

The period number = ………….

1

atomic numbers

2

no. of electrons in outer level

3

no. of energy levels

4

atomic weights

تصحيح

……..React instantly with water

1

K a nd Na

2

Cu a nd Ag

3

K a nd cu

4

k a nd Ag

تصحيح

Modern periodic table has …………..

1

7 ho r izontal periods a nd 8 vertical groups

2

17 ho r izontal periods a nd 18 vertical groups

3

18 ho r izontal periods a nd 7 vertical groups

4

7 ho r izontal periods a nd 18 vertical groups

تصحيح

………..is smallest atomic size

1

Na Sodium

2

Fluo r ine F

3

Cesium Cs

4

Magnesium

تصحيح

………….discovered the main energy levels

1

Mendeleev

2

Rutherfo r d

3

Bohr

4

Moseley

تصحيح

Atomic weight measuring unit is picometre

1

False

2

True

تصحيح

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