Natural rubber is a polymer of: MCQ with Answer and Explanation

Explanation:
Atomic number 17 is chlorine. Electronic configuration: 2,8,7. Period number = number of shells = 3. Group number = 10 + valence electrons (for p-block elements) = 10+7 = 17. Hence Group 17 (halogens), Period 3. Group 1 has 1 valence electron, Group 16 has 6, Group 18 has 8 (except He). Simple method: period = number of shells.

Explanation:
Isotopes have identical atomic numbers (number of protons) but different mass numbers due to different numbers of neutrons. They have similar chemical properties but different physical properties like mass and density. Example: ¹²C and ¹⁴C, both have 6 protons.

Explanation:
Concentrated sulfuric acid (H₂SO₄) has a very strong affinity for water and is widely used as a dehydrating agent in laboratories. It can remove water molecules from compounds, such as converting sugar (carbohydrate) to carbon, and is used to dry gases that do not react with it.