Question

The elements with atomic numbers 9, 17, 35, 53, 85 are all [KCET 2004]
A) Noble gases B) Halogens C) Heavy metals D) Light metals

Answer 1

Halogens is the answer. atomic number 9 is fluorine,17 is chlorine,35 is bromine,53 is lodine and 85 is astatine.

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Answer 2

Answer: The correct answer is Option B.

Explanation:

Noble gases are the elements which belong to Group 18 of the periodic table. The atomic number of the elements present in this group are 2, 10, 18, 36, 54 and 86.

Metals are the elements which loose its electrons to attains stability. Most of the elements in the periodic table are metals. They can be heavy or light.

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.

Thus, the correct answer is Option B.