1. What values are needed to determine the energy of an electron in a many‑electron atom?
O n
O
O m
O ms
2. What information is most important in determining the size of an orbital?
O n
O
O m
O ms
3. What information is needed to determine the orientation of an orbital?
O n
O
O m
O ms
4. What information is needed to determine the general shape of an orbital?
O n
O
O m
O ms

1. n

2. n

3.

4. l

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1).For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from -l to +l.

Spin Quantum number : It describes the direction of electron spin. This is represented as s.

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