Helium

He is the symbol for the chemical element helium, which has the atomic number 2 and the construal "sun" in greek. It is the first member of the noble gas group in the periodic table and an achromic, insipid, inert, non-toxic, monatomic gas. Of all the elements, it has the lowest melting and boiling points. In the overt macrocosm, it is the second-lightest and second-most plentiful element (hydrogen is the lightest and most abundant). More than 12 times the mass of all the heavier elements amalgamated, it makes up around 24% of the total mass of the elements. By virtue of helium-4 has a relatively high nuclear binding energy (per nucleon), compared to the following three elements after helium, its abundance is akin to that of the sun and jupiter. Adscititiously, the fact that helium-4 is a byproduct of both nuclear fusion and radioactive decay can be attributed to its high binding energy. Helium-4 makes up the astronomical bulk of the helium in the macrocosm, and it was mostly engendered during the sizably sizably voluminous bang. Nuclear fusion of hydrogen engenders astronomically brobdingnagian amplitudes of incipient helium in stars. during a solar eclipse in 1868, georges rayet, captain c. T. Haig, norman r. Pogson, and lieutenant john herschel made the first kenned detection of helium, which was later attested by French scientist jules janssen. Janssen and norman lockyer are frequently given shared credit for discovering the element.