... of the Al2O3 are packed very tightly, and thus the layer does not allowed the atmospheric oxygen to pass through. This ...
... bonded into hexagonal structures. These exist in layers , which are not covalently connected to the surrounding layers ...
...the 2D structure of atom. for sodium, it contain 2 electrons in the 1st layer (1s2), 8 electrons in the 2nd layer (2s2+2p6), and 1 electron in the 3rd layer ...
...:The surface of aluminum metal is covered with a thin layer of oxide that helps protect the metal from attack by air. So, normally, aluminum...
... shake well the solutions: Iodide solution: The hexane layer (upper layer ) changes from colourless to purple. This ...
... is ozone hole, which means the concentration of ozone at the ozone layer is substantially lower than other part of the layer , but this ozone hole...
...與空氣的 reaction,在 aluminium 的表面形成一層 aluminium oxide layer 。這層 oxide layer 的結構非常緊密,空氣中的oxygen 不能穿過這層 oxide layer ...
...ii)Graphite石墨--- since there is weak intermolecular force between the layer , the layer can easily slide over one anther. There is free e- within the...
...a kind of fluorocarbon polymer called Teflon (鐵氟龍). This layer is highly inert and it can avoid the stain and it is quite stable below...