Asingle atom of an element has 11 protons, 11 electrons, and 12 neutrons. which element is it?
a. v
b. na
c. mg
d. se

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Which characteristics can be used to differentiate star systems? check all that apply.