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JEE Main20264 April 2026Morning ShiftChemistryStructure of AtomActual

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

Options

  1. A80, 17 , liquid
  2. B81, 16 , solid
  3. C80, 16 , gas
  4. D81, 15 , gas

Correct answer

A. 80, 17 , liquid

Step-by-step solution

Number of electrons in A⁻ is 36 . Number of electrons in neutral atom A = 36 - 1 = 35 . Atomic number of A = 35 . Number of protons in A = 35 . Atomic mass of A = Number of protons + Number of neutrons = 35 + 45 = 80 . The element with atomic number 35 is Bromine ( Br ). Bromine belongs to Group 17 of the periodic table. The physical state of Bromine at room temperature is liquid. Answer: 80, 17 , liquid

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