The is a measure of how many wavelengths pass a given point per second. *

The frequency is a measure of how many wavelengths pass a given point per second

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.

Ithink it’s: light bounce if off a mirror