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The Bohr orbit radius for the hydrogen atom (n=1) is approximately 0.530Å . The radius for the first excited state (n=2) orbit is:
(1) 0.13Å
(2) 1.06Å
(3) 4.77Å
(4) 2.12Å
Ans: 2.12Å
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The following has zero valency : (1) Sodium (2) Beryllium (3) Aluminium (4) Krypton Ans: Krypton
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