Answer:
Each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name.
Explanation:
It's easier for you to solve these than to try and read my solutions if I solve them.
Use this magic formula:
(period) · (frequency) = 1
If you handle the magic formula carefully and correctly, you can get these facts out of it:
-- Period = 1 / frequency
-- Frequency = 1 / period
Use the first one to solve #1.
Use the second one to solve #2.
