Identify the atomic number of Iodine that belongs to group 17.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 53.
Iodine is a chemical element that belongs to Group 17 of the periodic table, known as the halogens. Halogens are non-metallic elements characterized by high reactivity and the ability to form salts with metals. Iodine has the atomic number 53, which means it has 53 protons in its nucleus. It is a dark violet-black solid at room temperature and is essential in small amounts for human health, particularly for the production of thyroid hormones. Like other halogens, iodine forms diatomic molecules (I₂) and readily reacts with various substances, making it important in medicine, photography, and chemical industries.