a)What is the total number of p electrons in a single (ground state) K atom? b)W

Question

a)What is the total number of p electrons in a single (ground state) K atom?

b)What is the principal quantum number (n) for the valence electrons in arsenic?

c)The wave function for an electron can be factored to separate out the so-called radial function (Rn,l(r)).
The radial probability distribution (4r2R2) gives the total probability of finding the electron at distance r from the nucleus.   
This probability is precisely zero only at (n - l)  finite values of r.

If the graph below represents the radial probability distribution for an electron in a d-orbital, what is its principal quantum number (n)?

Explanation / Answer

a.K = 19 1S22S22P63S23P64S1 total number of electrons in K atom is 6 (2P)+6(3P) = 12

b. Arsenic =33 1S22S22P63S23P64S23d104P3

last elctron means valency elctron enter into 4th shell. So principal quantam number is 4

c.4d orbital have one radial nodes

number of radial nodes = n-l-1 = 1

                                 = 4-2-1 = 1

that is 4d orbital

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