JEE Main 2026 — Apr 4, Shift 1 — Chemistry solution

JEE Main2026Apr 4, Shift 1Chemistry

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 :

A
$80, 17,$ liquid
B
$81, 16,$ solid
C
$80, 16,$ gas
D
$81, 15,$ gas

Solution

$A^{-}$ has $36$ electrons, so neutral $A$ has $Z = 35$ . With $45$ neutrons, mass number $= 35 + 45 = 80$ .

$Z = 35$ identifies the element as bromine, sitting in Group $17$ (halogens). At room temperature $B r_{2}$ is the only halogen that exists as a liquid.

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