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Na has the atomic number of Na is 11. hence its atomic structure is 2,8,1. It has a lone electron in the outer shell. In general, atoms have the tendency to make the outer shell complete. If Na loses one electron its outer shell will be complete. When an electron is lost, it proton number will be increased by 1, since electron and protons are equal. When the number of the proton is increased than electron it charges increase to positive. Hence cations are formed. Colours are produced by the transition metal, which is its inherent properties. The other cause for producing colors occurs at the atomic level. For example, when you heat a metal, electrons are excited due to gaining of energy. When they return to the normal state, gained energy is release out. This released energy sometimes will be in the visible range of light spectrum. Colours are produced according to that of the wavelength of energy released.
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Your Bibliography: Anon, (2017). [online] Available at: https://scienceaid.net/chemistry/applied/testcations.html [Accessed 9 Feb. 2018].
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