An isotope of magnesium has a mass of 26. How many neutrons has it got?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How do scientists think that gravity affected the formation of our solar system?

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate