Electrons orbit around the nucleus of atoms in allowed energy states. this is the basis of the theory of which scientist?
a. john dalton
b. niels bohr
c. albert einstein

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

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.

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+