Which of the following observations does not apply to Group I elements?
They are relatively soft metals.
They corrode quickly when exposed to air.
They react very quickly with water releasing hydrogen gas
They produce acidic solutions in reaction with water.
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Which statement about the Alkali metals is correct?
Potassium is more dense than lithium.
Lithium has a higher density than sodium.
Potassium is less reactive than sodium.
The melting point of sodium is higher than lithium.
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The elements in Group I of the Periodic Table show trends in both their reactivities and their melting points. Rubidium is in Group I.
Which statement about rubidium is correct?
It has a higher melting point than potassium.
It reacts with water to produce an acidic solution.
It reacts with water to produce oxygen gas.
It is more reactive than potassium.
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Group I elements and transition elements are metals.
Student X suggests that the Group I elements are above hydrogen in the metal reactivity series but that not all transition elements are.
Student Y suggests that the densities of Group I elements are lower than those of the transition elements.
Which students are correct?
both X and Y
X only
Y only
neither X nor Y
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Bromine and rubidium react together to form the compound rubidium bromide. Which row correctly describes the formula and colour of rubidium bromide?
| Â | formula | colour |
| A | RbBr | dark grey |
| B | RbBr2 | dark grey |
| C | RbBr | white |
| D | RbBr2 | white |
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The reactivity of the alkali metals increases moving down the group. Which statement explains this observation?
Decreasing distance between the nucleus and outer shell makes it easier for the metals to lose their valence electrons.
Increasing distance between the nucleus and outer shell makes it harder for the metals to lose their valence electrons.
Increasing distance between the nucleus and outer shell makes it easier for the metals to lose their valence electrons.
Decreasing distance between the nucleus and outer shell makes it easier for the metals to lose their valence electrons.
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Properties of four alkali metals labelled are shown in the table. Which one is placed lowest in the group?
| Â | melting point / oC | density / g cm-3 |
| A | 39 | 1.50 |
| B | 28.5 | 1.93 |
| C | 98 | 0.98 |
| D | 63.5 | 0.86 |
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