The elements in group 17 of the periodic table are all called halogens. all halogens have the same

They have same number of valence electrons.

Explanation:

Group 17 elements are known as halogens and these include fluorine (F), chlorine (Cl), Bromine (Br), iodine (I) and Astatine (At).

The valence electronic configuration of Group 17 elements is:   where n = period number

The number of valence electrons for these elements are 7.

Hence, all the elements in Group 17 have same number of valence electrons.

idk i’m struggling too

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.