It is an essential plant micronutrient, required for cell wall strength and development, cell division, seed and fruit development, sugar transport and hormone development, though high levels are toxic. Boron (B) does not occur naturally as a free element, but in compounds such as borates.Between 1% and 15% of people are sensitive to beryllium and may develop an inflammatory reaction in their respiratory system and skin, called chronic beryllium disease. Beryllium is classified by the International Agency for Research on Cancer as a group 1 carcinogen. Small amounts of beryllium were synthesised during the Big Bang, although most of it decayed or reacted further within stars to create larger nuclei, like carbon, nitrogen or oxygen. Beryllium (Be) has one of the highest melting points of all the light metals. It is the heaviest primordial element forged in large quantities during the Big Bang. In its non-ionized state it is one of the most reactive elements, and so is only ever found naturally in compounds. Lithium (Li) is the lightest metal and the least dense solid element.They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen. Period 2 elements involve the 2s and 2p orbitals. Such 'radiogenic' helium is trapped within natural gas in concentrations of up to seven percent by volume. On Earth, helium is relatively rare, only occurring as a byproduct of the natural decay of some radioactive elements. Most helium was formed during the Big Bang, but new helium is created through nuclear fusion of hydrogen in stars. It is the second-lightest element and is the second-most abundant in the universe.
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