Question

the value of principal quantum no. for 5s electron is
1.) 4
2). 3
3.) 5
4. ) 1
..... plz tell me the right answer with explanation don't copy it from Google..... plz humble request​

Answer 1

Explanation:

Principal Quantum number is denoted by 'n'

now, quantum theory goes like this:

The nucleus is at the center and electrons revolve around it in 3-D shells. For a given shell there can be subshell and depending on how many ways we can draw those subshell we have orbitals. Also,

Principal quantum number determines the overall size and energy of an orbital.

possible values: 1, 2, 3....

higher n value means more energy.

so,

In your question, you have asked, value of principal quantum number of an electron in 5s subshell. Notice there can be other subshells. In this case the possible subshells for n=5 are 5s, 5p, 5d, 5f, 5e each having different number of orbitals. So they have asked only about 5s subshell,

For 5s: n= 5

so,All the electrons in 5s subshell have principal quantum number n= 5.

3)is correct option