How many protons, neutrons, and electrons are there in one ion of  205Pb 2+ ?

Which of these distances is the longest?

How many kilometers (km) are there in 37 picometers (pm)?

What is the oxidation number (ON) of each element in the polyatomic anion, NO2- ?

What is the probability that a randomly selected exam will require between 14 and 19 minutes to grade?

What is the name of the compound, (NH4)2SO4?

It is exactly 2,449 miles from Justin Bieber’s current residence in California to his childhood home in Ontario, Canada. If Bieber is deported back to his home in Canada, approximately how many picometers (pm) will he have to travel?

What is the mass percentage of carbon in  C21H23NO5?

What is the mass percentage (% by mass) of carbon in dimethylsulfoxide (C2H6SO)?

Which group in the periodic table contains only nonmetals?