The structure of the atom on the basis of rutherford's experimental observations, which of the following statements describes the structure of the atom according to rutherford's atomic model? check all that apply.

a. in an atom, the positive charges are located in a small core within the atom called the nucleus.
b. in an atom, negatively charged electrons are dispersed in the space surrounding the positively charged nucleus of an atom.
c. in an atom, positively charged particles are dispersed in the space surrounding the negatively charged sphere.
d. in an atom, all of the positive and negative charges are randomly distributed.

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.