Elements and Atoms

An Extract from Inside Science

Universe		Earth's crust		Human body
hydrogen helium all others	90% 9% 1%	oxygen silicon aluminium iron calcium sodium potassium magnesium hydrogen all others	48% 27% 8% 4% 3% 2.5% 2.5% 2% 1% 2%	oxygen carbon hydrogen nitrogen calcium phosphorous all others	65% 18% 10% 3% 1.5% 1.0% 1.5%

Element	Symbol		Element	Symbol
aluminium calcium carbon chlorine copper helium hydrogen iron	Al Ca C Cl Cu He H Fe		lead magnesium nitrogen oxygen potassium sodium sulphur zinc	Pb Mg N O K Na S Zn