As unsaturated compounds they can combine with two monovalent atoms. Hydrogen is absorbed readily at ordinary temperature in the presence of platinum black, and paraffins are formed; the halogens (chlorine and bromine) combine directly with them, giving dihalogen substituted compounds; the halogen h
monovalent הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד