In which region of the periodic table would an element with the electron configuration below be located?

1s2,2s2,2p6,3s2,3p5

This element lie in the region of HALOGENS.

Step-by-step explanation:

The element with the electron configuration 1s2,2s2,2p6,3s2,3p5 is Chlorine(Cl)

" Chlorine is a chemical element with symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature "

Hence the element with the given electron configuration lie in the region of halogens.

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right