Chapter 1 Practice Paper: Atomic structure and the periodic table — question paper

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1. 1

   Which row of the table gives the correct relative charge and mass for a neutron?

   	Charge	Mass
   A	−1	1
   B	0	1
   C	0	1/1836
   D	+1	1
2. 2

   An ion of oxygen has 8 protons, 8 neutrons and 10 electrons. What is its charge?

   1. A2−
   2. B8−
   3. C2+
   4. D10−
   ( )
3. 3

   Atoms of carbon-12 and carbon-14 differ in the number of

   1. Aprotons
   2. Belectrons
   3. Cneutrons
   4. Dshells
   ( )
4. 4

   The plum pudding model was replaced after alpha particles were fired at gold foil. The key new idea was

   1. Aelectrons travel in fixed shells
   2. Ba tiny positively charged nucleus sits at the centre
   3. Catoms are indivisible spheres
   4. Dneutrons balance the atom’s mass
   ( )
5. 5

   How many electrons occupy the outer shell of an atom with electronic structure 2,8,7?

   1. A2
   2. B8
   3. C17
   4. D7
   ( )
6. 6

   Elements in the same group of the periodic table have the same number of

   1. Aneutrons
   2. Boccupied shells
   3. Couter-shell electrons
   4. Dprotons
   ( )
7. 7

   Which Group 1 metal reacts most vigorously with cold water?

   1. ALithium
   2. BSodium
   3. CMagnesium
   4. DPotassium
   ( )
8. 8

   A more reactive halogen will always

   1. Adisplace a less reactive halogen from its salt solution
   2. Bbe the lighter of the two elements
   3. Cform the more colourful solution
   4. Dgain electrons less readily
   ( )
9. 9

   The noble gases are unreactive because their atoms

   1. Aare monatomic gases
   2. Bhave full outer shells
   3. Ccontain no electrons
   4. Dare radioactive
   ( )
10. 10

    Which property would you NOT expect of a transition metal?

    1. AA high melting point
    2. BForming ions of several charges
    3. CExploding in cold water
    4. DActing as a catalyst
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   Bromine exists as two isotopes: 51% is bromine-79 and 49% is bromine-81.

   1. (a)

      Define the term isotope.

      [1]
   2. (b)

      Calculate the relative atomic mass of bromine from these figures. Give your answer to 1 decimal place.

      relative atomic mass =[2]
   3. (c)

      Explain why the two isotopes have identical chemical properties.

      [1]
   4. (d)

      Bromine’s atomic number is 35. State the number of neutrons in a bromine-81 atom.

      [1]
2. 12

   The Group 7 elements are compared in a class experiment. Chlorine water is added to aqueous sodium iodide; bromine water is added to a second sample of the same solution.

   1. (a)

      State the colour change when chlorine water is added, and name the product responsible.

      [2]
   2. (b)

      State the colour change when bromine water is added, and explain the observation.

      [3]
   3. (c)

      Iodine solution is added to aqueous sodium bromide. Predict and explain what happens.

      [2]
   4. (d)

      State one safety precaution for handling chlorine water in the laboratory.

      [1]
3. 13

   A student lists five statements about the periodic table and the particles inside atoms.

   The student’s statements

   Statement
   1. The nucleus of an atom contains electrons and protons.
   2. Mendeleev left gaps for elements not yet discovered.
   3. The period of an element equals its number of occupied electron shells.
   4. Group 0 boiling points increase down the group.
   5. Transition metals usually form ions with a single fixed charge.

   1. (a)

      Identify each statement as true or false.

      [5]
   2. (b)

      Choose one false statement and rewrite it so that it becomes true.

      [1]
   3. (c)

      For element Z with electronic structure 2,8,8,1, state its group, period and identity.

      [1]