what is the path followed by electron to the higher energy level when excited from its ground energy level ?

Answer 1

I don't think there's a "path". Electrons move further from the nucleus as they absorb energy and their orbits collapse back in as the energy is expended.

Answer 2

There is no "path" as such.
An electron moves to a higher energy level if it receives a precise amount of energy (a quantum, a level of energy of a photon).
For example, an electron of the 1st orbital will move to the 2nd orbital if it receives the exact energy to do so, or directly to the 3rd if it receives the exact energy difference between these two levels.
This energy level can be calculated using Rydberg equation:
1/lambda = R (1/n1² - 1/n0²).
where lambda is the wavelength (and energy level),
R = 10.972E6 mE-1 (the Rydberg Constant),
n1 the final level, n0 the initial level (both integers, 1, 2, 3 ...)
This shows that an electron can move from level 1 to level 2, or from 1 to level 3 etc WITHOUT passing by intermediary levels.
It also shows that ONLY if it receives the exact amount of energy will it absorb (emit) it and move to another level.
The energy levels can be calculated as:
E = h.f where h = Plank constant (6.626E-34), f = frequency (Hz)
and f = c/lambda as above., with c = speed of light 3.0E8.

Answer 3

The first energy level is 1s, which holds 2 electrons. After that is 2s. Electrons move instantaneously between energy levels, according to quantum physics. Energy levels are defined as the probable places for an electron to be in as they move.

Answer 4

It depends on the status of the electron before it is excited (ie non-bonding or bonding), the orbital in which it is located, whether or not it is spin paired, and the energy level to which it is promoted. To accurately picture what happens during electronic excitation one should consider the electron using molecular orbital theory and statistical mechanics.