Element X has 2 naturally occurring isotopes. The first isotope has an atomic mass of 44.009 amu and its natural abundance is 33.00%. The second isotope has an atomic mass of 40.50 amu. What is the atomic mass of element X?

Drug abuse will not lead to physical and psychological dependence. true or false ?

The element that has the greatest electronegativity is

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.