10. The elements with atomic numbers 9, 17, 35, 53, 85 are all A.Heavy metals B.Noble gases C.Light metals D.Halogens
Answer: Option D Solution: Halogens are the elements which belong to Group 17 of the periodic table. The atomic number of the elements present in this group are 9, 17, 35, 53 and 85. The elements are Fluorine, Chlorine, Bromine, Iodine and Astatine.
