What is 'R' as shown in the figure?

  • #1
navneet9431
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IMG_20180113_101616_392.jpg

what are those 'R' atoms(highlighted in red)?
Also,What is finely divided Nickel(marked in red)?
I will be thankful for help!
Note:I am a High School student and English is my second language!
 

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  • #2
DrDu
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R="Rest", is a generic abbreviation for that part of the molecule which is not explicitely drawn, e.g., an ethyl group. "Finely divided" means a very fine powder which has a high specific surface.
 
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  • #3
navneet9431
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R="Rest", is a generic abbreviation for that part of the molecule which is not explicitely drawn, e.g., an ethyl group. "Finely divided" means a very fine powder which has a high specific surface.
Thank you!
 
  • #4
symbolipoint
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Usually a hydrocarbon branch
 

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