21. What type of decay is this:
83 Li, 84 Ве, 0-1 e

m=9

step-by-step explanation:

7m+8=71 subtract   8 from 71 which is 63 than divide it by 7m   equal 9.

                             

Idon't know hope someone you

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

Answer heart of american                  live in harmony                    hillsides of orchards                    blaze of color                    backdrop of pines;