Question

If the mass of electron is doubled, the speed of electron revolving around $$Li^{2+}$$ nucleus will ________

Answer 1

Correct option is A. remain same
Velocity of an electron revolve around the nucleus in $$n^{th}$$ orbit is given as:

$$V_n=\dfrac{2\Pi Ke^{2}Z }{nh}$$

Z = Atomic no.
n = orbit
e = charge on an electron
h = Planck's constant

So according to the formula of velocity, there is no relation between mass and velocity of an electron moving around the nucleus.

So even If the mass of electron is doubled, the speed of electron revolving around $$Li^{2+}$$ nucleus will remain the same.

Hence option A is correct.