Chemistry final revision 2nd sec

The linear spectrum is a distinctive characteristic of elements because no two elements have the same:

• Physical properties

• Physical state

• Atomic mass

• Atomic number

The number of complete electron orbits for the element Scandium Sc in the gaseous state is:

• 8

• 9

• 10

• 11

The electrons in the sublevel 4S differ in quantum number:

• Principal

• Magnetic

• Secondary

• Spin

Which of these hydroxy acids is the strongest?

• HClO₄

• HClO₃

• H₃PO₄

• HNO₃

The following values (n=4,L=1,ml= -1 ,mS= +1/2 ) represent an electron in the sublevel:

• 4S

• 4P

• 4d

• 4F

What type of elements has the final configuration of nS1:2nP1:5?

• Noble

• Main group transitional

• Internal transitional

• Representative

The oxidation number of phosphorus in the phosphate ion (PO4)3− is

• +3

• +5

• +8

• -3

........ is considered one of Amphoteric oxides.

• CO₂

• MgO

• ZnO

• K₂O

The element that is in the second period and has a half-filled p subshell with electrons in its atomic state is

• O₈

• N₇

• B₅

• S₁₆

The substance that ionizes according to the equation MoH→M+ +OH− is ...........

• mineral acids

• organic acids

• salts

• alkalis