2.18 * 106 m/s
Expression for velocity of electron : v = (Z/n) x 2.2 x 106 where Z=atomic number and n = orbit number
Here we have to find electron velocity in 2nd orbit, so Z=2 and n=2.
v = (2/2) x 2.2 x 106 = 2.2 x 106 m/s
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