Periodic Table O Levels

Which statement about the trends shown by the elements of Period 3 in the Periodic Table is not correct?

• The elements become less metallic across the period.

• The group number increases across the period

• The number of electron shells increases across the period.

• The number of outer electrons increases across the period.

The diagram shows the positions of elements E, F, G and H in the Periodic Table.

Which statements about elements E, F, G and H are correct?

1 E has a higher density than F.

2 E has a higher melting point than F.

3 G has a darker colour than H.

4 G has a lower melting point than H.

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

When aqueous iodine is added to a solution of vanadium ions, V2+, the V2+ ions each lose one electron. Which property of transition elements is shown by this reaction?

• Transition elements have variable oxidation states.

• Transition elements form a stable 1+ ion.

• Transition elements are oxidising agents.

• Transition elements can act as catalysts

Chlorine gas is bubbled into aqueous potassium iodide. What is the ionic equation for the reaction that takes place?

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The noble gases are in Group VIII of the Periodic Table. Which statement explains why noble gases are unreactive?

• They all have eight electrons in their outer shells.

• They all have full outer shells.

• They are all gases

• They are all monoatomic.

Which statement is correct for all metals?

• They conduct electricity when molten.

• They gain electrons when they form ions

• They have a low density.

• They have a low melting point.

Which statement explains why metals are malleable?

• The atoms release electrons to become cations.

• The electrons are free to move.

• The electrons and the cations are attracted to each other.

• The layers of ions can slide over each other

Which diagram represents the arrangement of the outer-shell electrons of a noble gas?

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4 Lithium, sodium and potassium are elements in Group I of the Periodic Table. Chlorine, bromine and iodine are elements in Group VII of the Periodic Table. Which row identifies the least dense of these elements in each group?

• A

• B

• C

• D

Elements in Group IV of the Periodic Table are shown.

What does not occur in Group IV as it is descended?

• The proton number of the elements increases.

• The elements become more metallic.

• The elements have more electrons in their outer shell.

• The elements have more electron shells.