Which electron configuration represents the electrons of an atom in an excited state?
(1) 2-1 (3) 2-8-7
(2) 2-7-4 (4) 2-4

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

How many molecules are found in 1.32 mol of nacl?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same