4 Observando la tabla periódica, y partiendo de la electronegatividad de los elementos, determine: que elementos pueden generar enlaces con mayor facilidad (más reactivos, en termino de ganancia o pérdida de electrones).

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

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.