Which atom woukd tend to lose one valence electron to another atom to become stable

Apart of the periodic table is shown. a portion of the sixteenth and seventeenth columns of the periodic table is shown. column 16 reads eight oxygen, 16 sulfur, and 34 selenium. column 17 reads nine flourine, 17 chlorine, and 35 bromine. which of the following elements is less reactive than the others? bromine (br) oxygen (o) selenium (se) sulfur (s)

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?