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First broadcast in 1998. Gold has malleability, ductility and resistance to corrosion

First broadcast in 1998. Oxygen is the most abundant element on Earth

First broadcast in 1998. Helium is colourless, odourless, tasteless and non-toxic

First broadcast in 1998. Hydrogen is the lightest element on the periodic table

First broadcast in 1998. Iron forms the Earth's inner and outer core

First broadcast in 1998. Carbon is the second most abundant element in the human body

First broadcast in 1998. Uranium has a high atomic weight and is more dense than lead

First broadcast in 1998. Sodium is a soft metal but highly reactive

First broadcast in 1998. Silicon is used in items from breast implants to computers

First broadcast in 1998. Nitrogen forms approximately 78% of Earth's atmosphere