What is the total number of atoms in one formula
unit of MgSO4.7H2O?

Which other elements contain the same number of outer electrons as sodium

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?

What is the formula of the ionic compound composed of calcium cations and chloride anions