Astatine is found below iodine in Group 7 of the periodic table.
What is its formula and state at room temperature?
Formula | State at room temperature | |
A | At | gas |
B | At | solid |
C | At2 | liquid |
D | At2 | solid |
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Group Properties & Trends
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Group Properties & Trends
Astatine is found below iodine in Group 7 of the periodic table.
What is its formula and state at room temperature?
Formula | State at room temperature | |
A | At | gas |
B | At | solid |
C | At2 | liquid |
D | At2 | solid |
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Which row describes the properties of fluorine?
colour | state at r.t.p | more reactive than chlorine | |
A | yellow | gas | yes |
B | green | gas | no |
C | brown | liquid | no |
D | brown | gas | yes |
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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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Element X is an unreactive non-metal element. Where could this element be found on the Periodic table?
At the far left hand side
At the far right hand side
At the top of Group VI
At the bottom of Group VII
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Element X is found in Group 7 of the Periodic Table.
Which properties are typical of element X?
1 | Poor conductor of electricity |
2 | Malleable |
3 | High melting points |
4 | Form acidic oxides |
1 and 2
1 and 4
2 and 3
3 and 4
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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 reactivity of the halogens decreases moving down the group.
Which statement explains this observation?
Decreasing distance between the nucleus and outer shell makes it easier for the atom to attract electrons.
Increasing distance between the nucleus and outer shell makes it easier for the atom to attract electrons.
Decreasing distance between the nucleus and outer shell makes it harder for the atom to attract electrons.
Increasing distance between the nucleus and outer shell makes it harder for the atom to attract electrons.
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Which entry in the table matches the transition elements?
density | melting point | from coloured compounds | |
A | high | low | no |
B | high | high | yes |
C | low | low | no |
D | low | high | yes |
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Which row describes the properties of a typical noble gas?
outer electrons | atom or molecule | boiling point | |
A | full | atom | very low |
B | 6 | molecule | low |
C | 8 | atom | very high |
D | 6 | molecule | high |
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Astatine is a radioactive Group VII element which is extremely unstable, making it difficult to study. The physical and chemical properties of astatine can only be estimated.
Which row most likely describes the properties of astatine?
State | Colour | Reaction with KI (aq) | |
A | liquid | yellow | brown colour |
B | solid | green | no reaction |
C | gas | dark brown | brown colour |
D | solid | black | no reaction |
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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?
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?
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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Element Q is a halogen which reacts with aqueous potassium bromide, as shown in the reaction below:
Q2 + 2 KBr → 2 KQ + Br2
Which row describes element Q?
More reactive than bromine | Greater Ar than bromine | |
A | ||
B | ||
C | ||
D |
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A solution of a lithium halide and a halogen are mixed together. A reaction occurs and the mixture darkens in colour.
What is present in the reaction mixture?
Bromine and lithium chloride
Bromine and lithium fluoride
Chlorine and lithium iodide
Chlorine and lithium fluoride
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