Periodic table articles – Page 2
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Ideas
Mapping compound structure and bonding
How everyday compounds’ properties can be linked to their bonding and structure with a ‘structure triangle’
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News
Purest silicon sphere ever created will redefine the kilogram
Largest impurity is copper taking the place of one silicon atom in every three billion
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Feature
Modern-day alchemists
Sam Tracey visits Lawrence Berkeley National Laboratory to find out how to make a new element
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News
Gold nanoclusters offer route to better vaccines
New technique improves immune response and safety of hepatitis E vaccine
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Experiment
Heating Group 1 metals in air and in chlorine
This is a demonstration that shows the reactions of Group 1 metals in air and in chlorine. It does not clearly show the trends in reactivity of Group 1 metals, which are better demonstrated by the reactions in water, which follow on well from this demonstration.
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Experiment
Halogen reactions with iron wool
Illustrate an exothermic redox reaction by heating iron wool with a bunsen flame in the presence of chlorine gas and the vapours of bromine and iodine.
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Experiment
Reactivity trends of the alkali metals
Explore the trend in reactivity down Group 1 of the Periodic Table by looking at the similarity of the physical and chemical properties of the alkali metals.
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Experiment
Flame colours: a demonstration
Show the flame colours of alkali metals, alkaline earth metals, and other metal salts by safely spraying sodium chloride, potassium chloride, lithium chloride, copper sulfate and ethanol through a bunsen flame.
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Experiment
Microscale extraction of copper
Reveal the relative positions of copper and hydrogen in the reactivity series
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Soundbite
Harry Kroto: a fond farewell
Nina Notman pays her respects to Harry Kroto, a co-discover of the buckyball
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Opinion
The education of Harry Kroto
Kristy Turner reflects on Sir Harry Kroto's relationship with education
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News
Periodic table gains four new elements
Teams in Japan, Russia and the US credited with discoveries
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Soundbite
Hydrogen falls apart under pressure
Nina Notman learns that the simplest element in the universe is actually quite complex when put under pressure
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Experiment
Solubility trends of metal halides on microscale
In this experiment, the similarities and differences in the solubilities of the halides of some Group 1 & 2 metals and silver are investigated using a microscale technique.
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Experiment
Solubility patterns among anions of the halogens on microscale
On a microscale students add solutions containing lithium, calcium and silver cations to solutions containing fluoride, chloride, bromide and iodide anions, and record which combinations produce an insoluble precipitate. From the results they attempt to identify patterns of behaviour among these anions, and try to explain them.
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Experiment
Displacement series for non-metals
Potassium sulfide, chloride, bromide and iodide are tested with oxygen and chlorine to establish which non-metallic elements are displaced.
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Experiment
Properties of alkali metal compounds
This experiment shows the differences in the properties of various alkali metals. Solutions are prepared from these alkali metals with the pH and temperature changes recorded. Students also get to test their obervational skills by completing flame tests from these solutions.
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Opinion
Five ideas in chemical education that must die - part five
Eric Scerri explores outdated chemical concepts
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