Excited hydrogen atoms emit light in the ultraviolet at 2.47x1015Hz. What is the energy of a single photon with this frequency?

On a distance vs time graph the line of an object at rest is a

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false