i) Scientists have created all the elements beyond element 92. Find out how they have been made.
They are called transuranium elements. They are formed when a lighter neutron is charged into a heavier atom using a cyclotron invented by Ernest Lawrence in the 1930s. Thus their atomic number became bigger and thus form the man-made transuranium elements.
Source: http://science.jrank.org/pages/2410/Element-Transuranium.html
ii) It is said that the stars are the ‘element factories of the universe’, that is, stars make the elements. Do some research and find out how the stars make elements.
The stars are actually big groups of gases pulled together by their own gravity. They start off with the fundamental hydrogen elements, but then, at extreme temperatures, start to nuclear fuse, which results in helium, followed by other heavier atoms.
Source: http://imagine.gsfc.nasa.gov/docs/science/know_l2/stars.html
iii) Choose an element and research the following information about it:
- When it was discovered
- by whom it was discovered
- how it is found in nature
- its properties and uses.
Tungsten (W)
Discovered in 1783 by Fausto and Juan Jose de Elhuyar.
Tungsten is never found as a free element in nature. It comes in compounds such as scheelite or iron manganese tungstate.
It is added to other metals to make it a stronger alloy. It is also used importantly in lightbulbs.
Source: http://www.chemicalelements.com/elements/w.html
Source: http://www.chemistryexplained.com/elements/T-Z/Tungsten.html
Shao Xuan
(Post #2)
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