All Elements and the periodic table articles – Page 12

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    On This Day - Mar 03 : Joseph Wharton was born

    He improved the process of refining nickel (Ni) and his company made the first pure nickel metal. Wharton was the driving force in establishing the zinc (Zn) and nickel metal industries in the United States.

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    On This Day - Oct 02 : First atomic clock

    Atomic clocks keep time using the microwave signal that is emitted when electrons in atoms change energy levels. This early clock, the Atomicron, used the constant frequency from the oscillations of the caesium (Cs) atom at 9,192,631,830 MHz.

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    On This Day - Dec 01 : Martin Klaproth was born

    In 1789 he discovered uranium (U), which was named after the planet Uranus. This planet was actually discovered eight years earlier by another German scientist, William Hershel.

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    On This Day - Jan 24 : Morris Travers was born

    He worked with Scottish chemist William Ramsay to discover the noble gases krypton (Kr), xenon (Xe) and neon (Ne). He also played a pivotal role in setting up the Indian Institute of Science in Bangalore.

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    On This Day - Jan 21 : Magnesium produced

    Magnesium (Mg) was first extracted from seawater through an electrolytic process. Is the lightest of all structural elements – one-third less dense than aluminium – and is used in flares, pyrotechnics, incendiary bombs, aeroplane and missile construction.

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    On This Day - Jan 20 : de Chancourtois was born

    He was the first person to organise elements by atomic weights, by plotting a graph of the elements around a cylinder with a circumference of 16 units corresponding to the weight of oxygen (O). Elements that appeared above and below each other shared similar periodic properties.

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    On This Day - Jan 16 : Andres Ekeberg was born

    He discovered tantalum (Ta), which is named after the character Tantalus from Greek mythology. It is a rare transition metal that is highly resistant to corrosion.

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    On This Day - Jan 12 : Antonio de Ulloa was born

    He is credited with the discovery of platinum (Pt) after publishing in 1748 accounts of his time in South America. Platinum had actually been used by pre-columbian civilisations, making Ulloa’s work of a‘re-discovery’.

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    On This Day - Feb 06 : Discovery of germanium

    Germanium (Ge) is a silvery semi-metal element used in semiconductors. It is used as a transistor in thousands of types of electronics.

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    On This Day – Jan 01: Eugène Demarcay was born

    In 1901 he used spectroscopy to analyse material that had been carefully separated from samarium magnesium nitrate and discovered the element europium (Eu). His specialist knowledge of spectroscopy also helped Marie Curie confirm she had discovered radium (Ra). Related resources: Marie Curie and Aspects of the History ...

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    AfL: Writing formulae for ionic compounds

    Assessment for Learning is an effective way of actively involving students in their learning. Each session plan comes with suggestions about how to organise activities and worksheets that may be used with students.

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    AfL: Revising the Periodic Table

    Assessment for Learning is an effective way of actively involving students in their learning.  Each session plan comes with suggestions about how to organise activities and worksheets that may be used with students.

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    Earth's Crust

    The aim of this ‘starter’ activity is to introduce students to the common elements found in the Earth.

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    Minerals & elements in the Earth's Crust

    Use questions about the composition of minerals and ores to reinforce work on elements, compounds, symbols and formulae.

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    Halogens

    The halogens, group 7, are an important group of elements both chemically and socially. They are unusual in that they are coloured and diatomic. They also have an order of reactivity that is the opposite of the metals in groups 1 and 2. In fact they are all very reactive, ...

  • A sea cucumber, which contains vanadium in its blood pigment
    Elements

    Vanadium

    2012-05-01T00:00:00Z

    When the Earth moves so does the price of vanadium

  • EXHIBITION-CHEM_250
    Exhibition chemistry

    Going for Gold!

    2012-05-01T00:00:00Z

    Demonstrations designed to capture the student's imagination

  • Circular Mayan periodic table of the chemical elements
    Feature

    Trouble in the periodic table

    2012-01-01T00:00:00Z

    As chemists, we see the periodic table as an icon. But its design continues to evolve and is the source of much debate

  • Dissolving copper in nitric acid
    Exhibition chemistry

    Dissolving copper in nitric acid

    2011-11-01T00:00:00Z

    The dramatic reaction between copper and nitric acid ought to be seen

  • Healthy brain scan using technetium-99m. Here the brain activity is colour-coded, from red (most active) through yellow to green and blue (least active).
    Elements

    Technetium

    2011-09-01T00:00:00Z

    Technetium, so unique, so useful, so universal