The symbol ca-40 denotes that

a. a calcium atom contains 40 protons
b. a calcium atom contains 40 electrons
c. a calcium atom contains 40 neutrons
d. a calcium atom has a mass number of 40

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.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver