A certain isotope has a specific activity of 7.29 x 10^-4 Ci/g. How many alpha particles will a 75.0 mg sample emit in one hour? A. 7.28 x 10^9
B. 1.29 x 10^12
C. 9.99 x 10^4
D. 2.02 x 10^6

Variables,control,conclusion and finally scientific theory

Because you ate playdough

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

English , i don't understand spanish.