Answer:
I guess 3 to be honest and that's what I think
Rainbows go in the order of ROYGBIV, which is an acronym for red, orange, yellow, green, blue, indigo, violet.
So, it would start off with red.
If you want to know why it starts off the rainbow, its because red has the longest wavelength, compared to the rest of the colors. (sorry I'm rambling, I got excited)
Hope this helps.
Um, I think it’s: k is potassium and F is fluorine so potassium Fluoride
Tin is the shortest chemical element on the Periodic Table.
