seen from China
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seen from United States

seen from United Kingdom
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seen from Malaysia

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//Electron Subshells//
There are 4 types of subshell : s, p, d, f.
Shell 1 contains one s subshell. It can hold 2 electrons.
Shell 2 contains one s, one p subshell. The p can hold 6 electrons.
Shell 3 contains s, p, and d. The d can hold 10 electrons.
Shell 4 onwards contains s, p, d and f. The f can hold 14 electrons.
3p and 4s overlap due to electron shells becoming closer together as you travel further away from the nucleus of an atom.
A subshell is known as an orbital - this is the shape of the space where there is the highest probability of an electron being found in an atom.
(image from http://chemistry.compendiarious.net)