According to the periodic table, which two elements have an atomic mass less than twice their atomic number?

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Can someone me with questions 12 and 13 plz.

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons