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VOTE for your favourite scientist to win a ÂŁ500 prize to spend on communicating more science.
Helium is the chemical element with atomic number 2 and is represented by the symbol “He”. It has two protons and two neutrons in its nucleus and two electrons in it’s outer shell.
It is a colorless, odorless, tasteless and non-toxic gas and is one of the noble (or inert) Â gases. This means it is highly unreactive as its outer electron shell is full. Its boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions. Next to hydrogen, it is the second most abundant element in the Universe. In our galaxy it accounts for 24% of the mass.
Helium is available in pressurized tanks and is nowadays used to fill balloons. While it is heavier than hydrogen, it is far safer as helium does not burn.
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