LEARNit Dictionary
halogen
noun
/ˈhælədʒən/
UK
/ˈhælədʒən/
US
1
any of a set of five chemical elements, including fluorine, chlorine and iodine, that react with hydrogen to form
acids
from which simple salts can be made. Halogens, in the form of gas, are used in lamps and cookers.
هالوژن