Which of the following regions of the periodic table tends to prefer a –1 charge and occupies group 17?
a. alkaline earth metals.
b. halogens.
c. noble gases.

b. halogens

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements cannot be found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states.  

c is the answer because when something is left after something evaporates that shows the chemical change.

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