Suppose a new group 7A element is discovered. Photoelectron spectroscopy (PES) reveals that its last two peaks occur at 1610 kJ/mol and 1053 kJ/mol. Calculate the average valence electron energy (AVEE) of this element.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

What volume does 1.70 ×10–3 mol of chlorine gas occupy if its temperature is 20.2 °c and its pressure is 795 mm hg?