1. Construct a similar electron-dot expression for the change that occurred during Investigating Malter B.12 (page 71) when each of these events took place : a)An atom of zinc, Zn, was converted to a Zn^ 2+ ion (Hint: Zn has two readily removable electrons.) b)A silver ion Ag^ + converted to a metallic silver atom . Ag * (s) .

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.