A monoatomic anion $\left( A^{-} \right)$has 45 neutrons and 36 electrons. Atomic mass, group in the

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

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Sol. [Key Concept: $Z = 36 - 1 = 35$ (Br), mass $= 35 + 45 = 80$; group 17, and ${Br}_{2}$ is a liquid.]$X = Br$; Atomic mass $= 80$Period 4${Br}_{2}$ exist as liquid.

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