1. Rank these noble-gas atoms by their number of filled shells, from least to most: (a) argon, (b) radon, (c) helium, (d) neon. 2. A class of 20 students takes an exam and every student scores 80%....

1. Rank these noble-gas atoms by their number of filled shells, from least to most: (a) argon, (b) radon, (c) helium, (d) neon.

2. A class of 20 students takes an exam and every student scores 80%. What is the class average? Would the class average be slightly lower, the same, or slightly higher if one of the students instead scored 100%? How is this similar to how we calculated the atomic masses of elements?