A monoatomic anion ( $\mathrm{A}^{-}$) 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
Select the correct option:
A
80, 17, liquid
B
81,16, solid
C
80,16, gas
D
81, 15, gas
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Solution
$\mathrm{X}=\mathrm{Br}$; Atomic mass $=80$
Period 4
$\mathrm{Br}_2$ exists as liquid at room temperature.
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