I am in the 4th period, I have 10 electrons in my 3rd shell and only 2 electrons in my 4th shell. What am I?

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

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.