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ChemistryJEE Main 4 Apr 2026, Shift 1·Q8·MCQ·Easy–moderate

Structure of Atom · Atomic number and mass number

A monoatomic anion (AX−\ce{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 :
  1. (1)80, 17, liquid
  2. (2)81, 16, solid
  3. (3)80, 16, gas
  4. (4)81, 15, gas

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See the full 4 Apr 2026, Shift 1 paper