Nuclear decay occurs according to first-order kinetics. cobalt-60 decays with a rate constant of 0.131 years–1. after 5.00 years, a sample has a mass of 0.302 g. what was the original mass of the sample?

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.

Answerigneous bedrock of the oceanic crust;

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;