**Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,…**

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## Question “Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,…”

Identify which sets of quantum numbers are valid for an

electron. Each set is ordered (n, l, ml, ms).

Thanks in advance! Any helpful explanation on how to do this

problem would also be appreciated.

## Answer

Four quantum numbers: (n, l,ml,ms)

Four quantum numbers describe the most likely position of an electron in space.

The Pauli Exclusion Principle

There are four different sets of quantum numbers that can be assigned to electrons.

Hund’s Rule:

Each orbital is filled first by an electron in a subshell, before it can be fully filled.

Aufbau Principle:

The orbital with the lowest energy will be occupied by electrons first. This is used for determining the electronic configuration of an electron or atom.

Four quantum numbers and their symbol:

Quantum Number | Symbol | Potential values |

Principal quantum number | n | n=1, 2, 3, … |

Angular momentum quantum number | l | l=0, 1, 2, … , (n-l) |

Magnetic quantum number |
m | -l, … , -1, 0, +1, … , +l |

Spin quantum number |
m | +1/2 or -1/2 |

Principle: Order in which orbitals can be filled.

**(A)**

**(B)**

**Symbolic representation for beryllium elements with atomic number, mass number:**

Beryllium = Media_tag_4$

It contains four electrons.

Ground state electronic configuration beryllium =

Ans Part A

Each set of quantum numbers is valid for an electron. Each set can be ordered (n.l,m _{l} and m _{s}).

Part B

In their respective bins are the sets of quantum numbers that represent all electrons in neutral beryllium’s ground state.

## Conclusion

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