Why is the number 2? Please explain
1 answer:
Answer:
He (helium, that is) has 2 protons in its nucleus.
Explanation:
The placement of numbers around an element's symbol can be confusing. Generally, an element symbol written in this format has the atimic mass in the upper left and the element number on the lower left. The upper right is the lement's charge, zero in the is case because there are two electrons and two protons, for a net charge of zero.
Some symbols will include additional information, such as electron configuration. Be aware of a publication's standard for the notation style used.
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Answer:
Answer: (1R,2S) / (1S, 2R) , (1R,2R) / (1S, 2S)
Explanation:
Sodium borohydride reduction of benzoin will give four possible stereo isomers out of which are (1R,2S) - (1S, 2R) isomers and (1R,2R) - (1S, 2S) isomers which are known as enantiomers.
In general enantiomers show single spot in the TLC as they do not show any difference in Rf value (i.e) (1R,2S) - (1S, 2R) isomers show only one spot although they are two compounds and also (1R,2R) - (1S, 2S) isomers also show one spot. That is the reason why you are observing two spots in the TLC ( of reaction mixture) other than starting materilal.
