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.
The short answer is that most ionic bonds are formed between a metal and a non-metal, like NaCl. Covalent bonds form between non-metals like hydrogen, carbon, oxygen, and nitrogen like H 2 O or CO 2. The long answer has to do with electronegativity, the pulling power or attraction for electrons in a chemical bond.