# Lesson Worksheet: Quantum Numbers Chemistry

In this worksheet, we will practice using quantum numbers to describe an electron within an atom.

**Q1: **

The quantum numbers for three electrons in an atom of silicon are shown. What is the correct order from lowest to highest energy of these electrons?

- A3, 1, 2
- B2, 3, 1
- C2, 1, 3
- D1, 2, 3
- E3, 2, 1

**Q2: **

Which of these sets of four quantum numbers does not exist?

- A, , ,
- B, , ,
- C, , ,
- D, , ,

**Q3: **

If , how many possible values of are there?

**Q4: **

How many electrons in total can have the quantum numbers and ?

**Q5: **

The quantum numbers for the valence electron in an atom of lithium are , , , and . What are the quantum numbers for the second valence electron in an atom of beryllium?

- A, , , and
- B, , , and
- C, , , and
- D, , , and
- E, , , and

**Q6: **

If , how many possible values of are there?

**Q7: **

How many electrons can have a principal quantum number () equal to 1?

**Q8: **

What is the relationship between the principal quantum number, , and the total number of orbitals?

- A
- B
- C
- D
- E

**Q9: **

Two electrons, and , have the same energy. Electron has the quantum numbers , . What are the quantum numbers of the electron , knowing that it spins in the opposite direction?

- A
- B
- C
- D

**Q10: **

Which of the following is correct when two electrons of an atom have the same and values?

- AThey must be located in the same energy level.
- BThey can not have the same and values at the same time.
- CThey are not located in the same energy sublevel.
- DThey must have the same spin direction.