Calculate the velocity of an electron ejected from a hydrogen atom by incident l

Question

Calculate the velocity of an electron ejected from a hydrogen atom by incident light of wavelength 194 A. List all orbitals found in the n=3 shell and give the set of 3 quantum numbers for each orbital. Is a 3f subshell possible? Explain using quantum number rules. Write a set of 4 quantum numbers for the following electrons: Valence electron of Rb Lowest energy electron of P Highest energy electron of Sn Write the following electron configurations for the ground state: Zr (noble gas core with expanded spdf notation) Au (noble gas core with condensed spdf notation) As (expanded spdf notation using an orbital box diagram, no noble gas core) How many valence electrons do each of the following atoms have? Pb Mg Ti

Explanation / Answer

6) a) Pb has an atomic number of 82 and has 4 valence electrons in 6th shell

b) Mg has an atomic number of 12 and has 2 valence electrons in 3rd subshell

c) Ti has an atomic number of 22 and has 2 valence electrons in 4th subshell

5) a) Zr40 = [Kr] 5s24d2

b) Au79 = [Xe] 4f145d106s1

c) As33 = 1s2 2s2 2p6 3s2 3p6 4s2 3d104p3

3) No a 3f subshell is not possible as azimuthal quantum numbers can take value from n =0 to (n-1)

Thus for n = 3 ; l = 0,1,2 i.e. only s,p & d subshell are allowed

2) for n = 3 ; l = 0,1,2 i.e. only s,p & d subshell are allowed

the quantum numbers will be

n = 3 ; l = 0 ; m = 0 ; s = +/- (1/2)

n = 3 ; l = 1 ; m = -1,0,+1 ; s = +/- (1/2)

n = 3 ; l = 2 ; m = -2,-1,0,+1,+2 ; s = +/- (1/2)

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