Definition of expend in the AudioEnglish.org Dictionary. Meaning of expend. What does expend mean? Proper usage and pronunciation (in phonetic transcription) of the word expend. Information about expend in the AudioEnglish.org dictionary, synonyms and antonyms.
Confidence votes 36. Covalent bonds usually form between the electrons in the outer valence of an atom. For study island the answer is nonmetals and nonmetals. Covalent bonds usually form between the electrons in the outer valence of an atom. For study island the answer is nonmetals and nonmetals.
Covalent bonds form between atoms of nonmetallic elements. In general, bonds are considered to be covalent if the electronegativity difference between the two atoms bonding is less than 2.0 Pauling units. (Some sources list slightly lower values as the cut off. I've seen 1.7 or 1.8 in a few places.)