Chemistry · Structure of Atom

JEE Main 2026 — 4 April, Morning Shift — Question 55

A monoatomic anion $\left(\mathrm{A}^{-}\right)$ 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 :

Option A:
80,17 , liquid
Correct
Option B:
81,16 , solid
Option C:
80,16 , gas
Option D:
81,15 , gas

Answer: A

Step-by-step solution

$\mathrm{X}=\mathrm{Br}$ ; Atomic mass $=80$ Period 4 $\mathrm{Br}_{2}$ exist as liquid.

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Exam: JEE Main 2026
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Structure of Atom
Topic: Subatomic Particles

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Answer: A

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