What conclusion is best supported by the decay chain?
each alpha decay results in an isotope that is slightly more stable than the original isotope.
each beta decay results in an isotope that is slightly more stable than the original isotope.
the atomic number increase caused by two beta decays is the same as the decrease caused by one alpha decay.
the mass number increase caused by two beta decays is the same as the decrease caused by one alpha decay.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

answerambulatory;

the answer is symmetrical : )