The answer is C. You must divide your wavelength and your frequency to get your answer.
The short answer (and the long one for that matter) is physical properties of chemicals. If you are being marked by a machine, likely the answer is going to be physical properties.
The answer is 175184.08 joules
If you go to the right along the periodic table, electronegativity increases.
So the larger the column number, the greater the electronegativity.
-Lithium has lowest as it is in the 1st column
-Beryllium (2nd column)
-Boron s (13th column)
-Nitrogen (15th column)
