Task: Text Categorization
Input (English): The difference between this value for constituent atoms increases going up the right side of Ketelaar's triangle. The spectroscopic type of it was developed by Leland Allen, and it is inversely proportional to the square of the covalent radius and proportional to the effective nuclear charge in the AllredRochow type. Ionization energy and electron affinity are added together to determine the Mulliken type, and fluorine, measuring four, has the highest value according to the Pauling scale for it. For 10 points, name this measure of the tendency of an atom in a molecule to attract electrons within bonds.
Output (English): Science