Compounds composed of molecules (molecular compounds) usually contain only elements.
举一反三
- Matter is composed of ______ , compounds and ______ .
- All minerals are compounds of various elements.
- Vitamins are a class of high molecular organic compounds( )
- S-containing compounds are a group of naturally occurring chemical compounds that mostly contain basic nitrogen atoms.
- ( ) are organic compounds that are chemically based on carbon, hydrogen and other nonmetallic elements.