Is alcohol a hydrocarbonis alcohol a hydrocarbon

Alcohols are not hydrocarbons.by definition, hydrocarbons are only made up of hydrogen and carbon.by definition, alcohols have at least one group of  -oh.  since alcohols have oxygen, they can't be considered a hydrocarbon. (alcohols may contain hydrocarbons groups, but that doesn't necessarily classify them as hydrocarbons themselves.) 

Sr or Strontium

Explanation:

sr: strontium has atomic radius of 255pm

cu: copper has an atomic radius of 128pm

they teach you in chem how to do it based off the chart but I don't remember that method