What is the mass of (7.11x10^27) atoms of phosphorus?

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17