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| 4 |
Essential element present in all foods, its radioactive isotope accounts for more than half of the natural radioactivity in our bodies. (9) |
1 |
Which element in acid form can kill you by interfering with calcium in your blood when absorbed through your skin, but is a key ingredient in toothpaste? (8) |
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Cereals are fortified with which element that also fertilised the abundance of life in the ocean during the last ice age through dust? (4) |
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Which element in too high a concentration kills bacteria and so is used in mouthwash, but is also key for life in thousands of proteins? (4) |
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Element found in high concentrations in Napoleon's hair, present in sea creatures such as lobsters and plaice, and in a frontline treatment for a form of leukaemia. (7) |
3 |
Which metal burns so brightly it is often found in fireworks, helps balance charge in the body and messed up it is "amusing me"? (anagram) (9) |
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Which element helps light a match, is in your bones, and limits life in some parts of the ocean? (10) |
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Edible Apricot cooked for a chemical system. (anagram) (13) |
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As the main component of our atmosphere this element is triply-bonded, and a vital component of proteins, but remarkable difficult for life to access. (8) |
5 |
Which element acts as an antiseptic (and can be added to dirty water to make it potable) but is also key for function of the thyroid? (6) |
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This element gives volcanic gas its eggy smell, however it is also a key component of amino acids and proteins for binding metals. (7)
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Which element is against capitalism? (cryptic) (8) |
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Which element do corals need to produce their skeleton and is also found in milk? (7) |
8 |
Which element is common to: mad hatters, the smallest planet in the solar system, ointment for treatment of eyelid infections? (7) |
| 15 |
Which metal is common in hand creams and also is most common in mineral water and seawater? (6) |
9 |
This element is used in swimming pools to kill microorganisms which could cause infection. The more the swimming pool smells of it, the more microorganisms have been killed... (8) |
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Which unintentionally accumulated gas produced by microorganisms transformed irreversibly the chemical landscape of the Earth 2.5 billion years ago and was essential for the emergence of complex life? (6) |
12 |
The densest of all metals, and with a suitable organic coating is highly effective in killing cancer cells. (6) |
| 17 |
Which element can be found in both Marmite and a blue biro? (6) |
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| 18 |
Who invented the periodic table? (15) |
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