Meg, sandy, chang, and nathan used different methods to protect themselves from over-exposure to the sun. their methods are listed below: meg: use a sun tanning or uv tanning booth instead of staying on the beach for long hours sandy: stop all outdoor activity and always stay indoors chang: apply sunscreen half an hour before going out and reapply every 2 hours nathan: use sunscreen with very low spf once per day who used the best method for daily activity? chang meg nathan sandy

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.