Answer:
The volume would be higher than 8.3.
Explanation:
D) 59 (protons+neutrons=mass)
Answer: 8.1 days
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = x
a - x = amount left after decay process=
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) for completion of one fourth of reaction



Thus after 8.1 days , one fourth of original amount will remain.
Americium at standard temperature and pressure is solid. This element is a radioactive one and is a member of the actinide group. It was first produced by the group of Glenn T. Seaborg. It common application is in household smoke detectors.