Based on the number of valence electrons indicated by its location in the periodic table, which element's behavior would you predict to be closest to that of potassium (K)?
A. Chromium (Cr)
B. Strontium (Sr)
c. Krypton (Kr)
D. Francium (Fr)

Which best describes how johannes kepler developed his laws of planetary motion

What is the mass of 8 moles of sodium atoms

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.