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Due to ignorance of its toxic properties, both the Greeks and Romans used mercury in medical ointments and beauty products.

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Nickel can be a skin allergen in some people, so iron replaced it in coins.

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It makes up roughly 1.5% by mass of the Earth's crust.

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German chemist Martin Heinrich Klaproth is credited with discovering uranium in 1789. He named the new element after the recently discovered planet Uranus.

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It was one of the first five metals to be discovered.

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Silicon Valley gets its name from the silicon used in computer chips.

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It is a vital part of living cells, including nervous tissue, bones, and the protoplasm of many cells.

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Its name comes from the Sanskrit word "sulvere."

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The crust contains around two parts per million of tin.

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It makes colors bright

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Henri Croissant, who first isolated fluorine, also produced the world's first artificial diamonds by applying huge pressures to charcoal.

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Oxygen does not burn – honestly! It does, however, support the combustion of other substances. Think about it — if oxygen itself actually burnt, striking a match would be enough to burn all of the oxygen in our planet’s atmosphere.

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Under normal conditions nitrogen is a colorless, odorless and tasteless gas.

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Carbon forms a large number of compounds, more than any other element

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It's so light it can float on water

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Helium is a chemical element with the symbol He and atomic number 2.

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Hydrogen is the simplest and lightest element on the periodic table of elements