The electron configuration for Ga is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1.

## What is the ratio of radii of the orbits corresponding to first?

Answer. Radius of the nth orbit rn ∝ n2. For ground state n = 1 and for the first excited state n = 2. Therefore r2/r1 = 22/1 = 4/1 = 4:1.

4 : 1

## What is the radius of orbit in second excited state?

The radius of innermost electrone orbit of hydrogen atom is 5.3 *10^-11m. What is the radius of orbit in the second excited state. 2nd excited state implies that n=3. There the radius of the second excited state i.e., r(n =3) = r’ * 3^2 = 5.3*10^-11*9 = 4.77*10^-10 m.

## What do you mean by Bohr radius?

The Bohr radius (a0) is a physical constant, equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state (non-relativistic and with an infinitely heavy proton). It is named after Niels Bohr, due to its role in the Bohr model of an atom.

four times

## When a hydrogen atom is raised from the ground?

Although it is inversely proportional but due to negative sign, when the radius is increased, the potential energy is also increased. Hence, when a hydrogen atom is raised from ground state to excited state, its potential energy increases whereas kinetic energy decreases. So, the correct answer is “Option C”.

1/2

## When hydrogen atom is in its second excited level then its radius becomes?

When the hydrogen is in a second excited state, the value of n is equal to 3. Therefore, the radius of a hydrogen atom when it is in its second excited state is nine times its radius when it is in its ground state.