A Measure of the Combining Power of an Element
This page is the CodyCross answer for the clue below from Singapore, Group 2030, Puzzle 2 (Protected Wetlands).
Question is: A Measure of the Combining Power of an Element
and the answer is: VALENCE
Word Meaning:
VALENCE — The combining capacity of an atom, functional group, or radical determined by the number of atoms of hydrogen with which it will unite, or the number of electrons that it will gain, lose, or share when it combines with other atoms, etc.
Definitions from Wiktionary.