Quiz , Unit (1), Lesson (1)

The element (₉X) is located in ......................... in the periodic table

• Period (3), Group (7A)

• Period (2), Group (6A)

• Period (2), Group (7A)

• Period (3), Group (6A)

If you know that the atomic number of sodium is 11, calculate the atomic number of potassium.

• 19

• 20

• 21

• 22

Scientist Bohr discovered ........................................

• The protons

• The neutrons

• The energy levels

• The atom

All of the following are advantages of Mendeleev's table EXCEPT ...........

• He left empty gaps for the newly discovered elements

• He put Irion, Nickel, in the same cell

• He corrected the atomic weights of some elements

• He divided the main group to tow subgroups

Mosely classified elements according to the ............................

• Increase of their atomic weights

• Decrease of their atomic weights

• Increase of their atomic numbers

• Decrease of their atomic numbers

An element located in period (4), group (7A)

So, its atomic number is ..................................

• 22

• 23

• 24

• 25

Chlorine gas is very toxic, according to its electronic distribution shown, it located in ............................... in the periodic table

• Period 2, Group (4A)

• Period 3, Group (4A)

• Period 3, Group (6A)

• Period 3, Group (7A)

The number of elements in the modern periodic table is ................................

• 115

• 116

• 117

• 118

The scientist how added Zero group is ......................

• Rutherford

• Mendeleef

• Mosely

• Bohr

Magnesium (₁₂Mg) has the same chemical properties of .................................

• Sodium (₁₁Na)

• Florine (₉F)

• Calcium (₂₀Ca)

• Oxygen (₈O)