Isotopes (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

54 mins9 questions
11 mark

The atomic structure of atoms Q, R, S and T are shown in the table.

Atom

Number of protons

Number of neutrons

Number of electrons

Q

6

7

6

R

7

7

7

S

6

8

6

T

8

8

8

Which two atoms are isotopes?

A

Q and S

B

Q and T

C

R and T

D

R and S

    11 mark

    Two isotopes of chlorine are 35Cl and 37Cl.

    Using these isotopes, how many different relative molecular masses are possible for the compound with molecular formula C2H3Cl3?

    • 2

    • 3

    • 4

    • 5

    11 mark

    Which row correctly describes the number of outer shell electrons and properties of isotopes?

     

    Number of electrons

    Chemical properties

    A

    same

    same

    B

    same

    different

    C

    different

    same 

    D

    different

    different

      2
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      1 mark

      Iridium has two isotopes, 191Ir and 193Ir. Calculate the relative atomic mass of iridium using the data given:

      Mass number

      191

      193

      Percentage abundance 

      62.7%

      37.3%

      • 191.2

      • 191.6

      • 191.7

      • 192.5