How many moles of mgs2o3 are in 221 g of the compound?

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.