To find the atomic mass (atomic weight) of an atom you need to
a. how many protons are in the atom
b. how many neutrons are in the atom
c. the average number of protons and neutrons of all like substances on earth (example- silver)
d. the chemical symbol, using letters

answer; i believe the correct answer is (solid gold);

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying