What do the letters in the boxes of the periodic table represent

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule

How many atomic mass units are equal to 1.672×10−24 g of protons?

What are the two basic types of satellites