Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved

answer; i believe that the correct answer is (a) potassium(k)

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

1 is the answer to this problem

it is stable as it is in group 0 which have full outer shells of electrons