JEE Main 2026 Chemistry question
A monoatomic anion (A⁻) has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are
Answer: (A)
Solution
Protons = electrons − 1 = 35 (Bromine). Mass number = 35 + 45 = 80. Br is in group 17 and is a liquid at room temperature.