Boron trifluoride is used as a catalyst in the synthesis of organic compounds. when this compound is analyzed by mass spectrometry (see tools of the laboratory, p. 55), several different 1 + ions form, including ions representing the whole molecule as well as molecular fragments formed by the loss of one, two, and three f atoms. given that boron has two naturally occurring isotopes, 108 and 113. and fluorine has one. 19f. calculate the masses of all possible 1 + ions.

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?