Question

6. If the first and second principal energy levels are full, what would be the total
number of atomic orbitals?
7. How many principal energy levels are needed to describe the electrons of all known
atoms?
8. What is the total number of electrons that could occupy the fifth principal energy
level based on the electron configuration?
9. How many electrons can be contained in the "f" sublevel?
10. Based on the electron configuration, how many sublevels does the principal
energy levels 5, 6, and 7 have?​

Answer 1

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Answer 2

Energy levels:

Explanation:

6)

• The first principal energy level contains three orbitals which are s-orbital while the second principal energy level contains six orbitals which are 2s & 2p.
• So total no of atomic orbitals present in the first and second principal energy levels are nine.

7)

• Only seven energy levels are needed to describe all the electrons in an atom of any of all known elements.

• There are four energy levels that describe the position and energy of the electrons in an atom. Principal energy levels are made up of sublevels, which are in turn made out of orbitals, in which electrons are found.

8)

• The total no of electrons present in the energy level is calculated by formula, $2n^2$ .
• So the total no of electrons present in the fifth energy level is 50.

9)

• The fourth and higher levels contain an f sublevel. This sublevel contains seven f orbitals, which can hold a maximum of 14 electrons.

10)

• The fifth principal energy level contains 4 sublevels i.e. 5s, 5p, 5d, 5f.
• The sixth principal energy level contains 4 sublevels i.e. 6s, 6p, 6d, 6f.
• The seventh principal energy level contains 4 sublevels i.e. 7s, 7p, 7d, 7f.