8. a) What is the purpose of the Quantum Mechanic theory of the atom? b ) State

Question

8. a) What is the purpose of the Quantum Mechanic theory of the atom?
b) State the two assumptions of the quantum mechanic theory.
c) The four quantum numbers can be considered as labels for any electron in the atom represented by n, l, ml, ms . What property of the electron on the energy level do each of these values describe?

9. a) What are the four quantum numbers of the only electron in Hydrogen?

b) When n= 3, what are all the values for l, ml, ms?

c) Give the n,l, ml, ms for all the electrons in an atom of Be, atomic number 4 (4 electrons).

Explanation / Answer

9Q

A. quantum numbers for hydrogen

Pricipal quantum number n = 1

azimuthal quantum number l = 0

magnetic quantum number ml = 0

spin quantum number s= +1/2

B.

Pricipal quantum number n = 3

azimuthal quantum number l =..-2, -1 0 1, 2..

magnetic quantum number ml = 0, 1,2...

spin quantum number s= +1/2 OR -1/2

C.

Pricipal quantum number n = 2

azimuthal quantum number l = 1

magnetic quantum number ml = -1

spin quantum number s= +1/2

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