Electron Configuration Practice Quiz

n atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6, using the notation explained below.

Electronic configurations describe each electron as moving independently in an orbital, in an average field created by all other orbitals. Mathematically, configurations are described by Slater determinants or configuration state functions. – wikipedia

Electron Configuration Quiz

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Electron Configuration – Basic Introduction

Test Questions and Answers

1. What atom matches this electron configuration? 1s22s22p63s2

• Neon
• Magnesium
• Aluminum
• Potassium

2. What atom matches this electron configuration? 1s22s22p63s23p64s23d10

• Zinc
• Copper
• Nickel
• Germanium

3. What is the electron configuration for a Sulfur atom?

• 1s22s22p63p6
• 1s22s22p63s23p6
• 1s22s22p63s23p4
• 3p4

4. What atom matches this electron configuration? 1s²2s²2p⁶3s³3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d⁹

• Mercury
• Gold
• Platinum
• Thallium

5. What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

6. Which of the following is the smallest in size?

• N
• S
• I
• Fr

7. Which of the following is the smallest in size?

• K
• Na
• Li
• Cs

8. How many electrons does Si contain?

• 14
• 28
• 2
• 4

9. How many valence electrons does Si contain?

• 14
• 28
• 2
• 4

10. How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

11. An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons

12. The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is

• 3
• 6
• 8
• 10

13. The electron configuration of an atom is 1s²2s²2p⁶.  The number of valence electrons in the atom is

• 3
• 6
• 8
• 10

14. What atom is represented here?

• Carbon
• Nitrogen
• Oxygen
• Fluorine

15. How many valence electrons are represented here?

• 7
• 5
• 2
• 8

16. What is the electron configuration for this atom?

18. What is the highest occupied energy level?

• 4
• 5
• 6
• 7

19. How many valence electrons are there?

• 1
• 2
• 8
• 79

20. How many orbitals are in the 4s sublevel?

• 1
• 2
• 3
• 4

21. How many orbitals are in the 4p sublevel?

• 2
• 3
• 4
• 6

22. How many orbitals are in the 4d sublevel?

• 2
• 4
• 5
• 10

23. How many orbitals are in the 4f sublevel?

• 2
• 4
• 7
• 14

24. After filling 5s, electrons would fill…

• 5p
• 4d
• 5d
• 3f

25. After filling 6s, electrons would fill

• 4f
• 5d
• 6p
• 7g

26. How many unshared pairs of electrons are in this orbital diagram?

• 2
• 3
• 5
• 15

27. How many unshared pairs of electrons are in this orbital diagram?

• 2
• 4
• 6
• 8

Term and Answer Keys

How are 1s and 2s orbitals alike/different?

They both have a similar layout. The 2s orbital has a greater chance of finding the electron since it is farther from the nucleus

what are the 3 p orbitals?

Great Sources:

1. https://en.wikipedia.org/wiki/Electron_configuration
2. Electron configuration at LibreTexts Chemistry
3. Electron configuration at FSU Chemistry
4. How to Write Electron Configurations for Atoms of Any Element at WikiHow

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