After undergoing alpha decay, an atom of radium-226 becomes
a. thorium-234
c. uranium-238
b. radon-222
d. radium-224

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

What is avogadro’s number, and why is it useful

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients