Which statement best describes an atom? (2 points) protons and neutrons grouped in a specific pattern protons and electrons spread around randomly a group of protons and neutrons that are surrounded by electrons a ball of electrons and neutrons surrounded by protons

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

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.