Questions on Noble Gas Configuration
20 Multiple-Choice Questions on Noble Gas Configuration
1. What is meant by a “noble gas configuration”?
A) A configuration that has no electrons
B) An unstable electron arrangement
C) A configuration that ends with the electron structure of a noble gas
D) An excited state of an atom
E) The electron configuration of metals
2. What is the noble gas configuration of sodium (Na)?
A) [He]2s²2p⁶3s¹
B) [Ne]3s¹
C) [Ar]4s¹
D) [He]2s²2p⁶2s¹
E) [Kr]5s¹
3. Which noble gas is used in the noble gas configuration of chlorine (Cl)?
A) He
B) Ne
C) Ar
D) Kr
E) Xe
4. What is the correct noble gas configuration of magnesium (Mg)?
A) [Ne]3s²
B) [He]2s²
C) [Ar]3s²
D) [Ne]3p²
E) [Kr]4s²
5. The noble gas configuration [Ar]4s²3d¹⁰4p⁵ corresponds to which element?
A) Krypton
B) Bromine
C) Argon
D) Iodine
E) Selenium
6. Which of the following elements has the noble gas configuration [Ne]3s²3p⁴?
A) Oxygen
B) Sulfur
C) Chlorine
D) Phosphorus
E) Magnesium
7. The noble gas configuration of aluminum (Al) is:
A) [Ne]3s²3p¹
B) [He]2s²2p⁶3s²3p¹
C) [Ar]3s²
D) [Ne]3s¹3p¹
E) [Ne]3s²3p²
8. Which element has the noble gas configuration [Kr]5s¹?
A) Strontium
B) Yttrium
C) Rubidium
D) Zirconium
E) Krypton
9. Which noble gas is used in the configuration of calcium (Ca)?
A) He
B) Ne
C) Ar
D) Kr
E) Xe
10. Which element’s noble gas configuration is [Ar]4s¹?
A) Potassium
B) Calcium
C) Scandium
D) Titanium
E) Sodium
11. Which of the following elements would use [Ne] in its noble gas configuration?
A) Sodium
B) Phosphorus
C) Magnesium
D) All of the above
E) None of the above
12. What noble gas is used in the configuration of gallium (Ga)?
A) Ne
B) Ar
C) Kr
D) Xe
E) Rn
13. What is the noble gas configuration of fluorine (F)?
A) [He]2s²2p⁵
B) [Ne]2s²2p⁵
C) [He]2s²2p⁶
D) [Ne]3s¹
E) [He]2p⁶
14. The configuration [Kr]5s²4d¹⁰5p⁶ represents:
A) A noble gas
B) A halogen
C) A transition metal
D) An alkaline earth metal
E) A metalloid
15. The noble gas configuration of nitrogen (N) is:
A) [He]2s²2p³
B) [Ne]2s²2p³
C) [Ar]3s²3p³
D) [He]2p³
E) [Ne]3s¹
16. Which element has the noble gas configuration [Ar]4s²?
A) Potassium
B) Calcium
C) Scandium
D) Vanadium
E) Zinc
17. Which is the noble gas configuration of iron (Fe)?
A) [Ar]4s²3d⁶
B) [Ne]3s²3p⁶3d⁶
C) [He]2s²2p⁶3s²3p⁶3d⁶
D) [Ar]4s¹3d⁷
E) [Kr]4d⁶
18. The noble gas configuration for sulfur (S) is:
A) [Ne]3s²3p⁴
B) [He]2s²2p⁴
C) [Ne]3s²3p⁶
D) [Ar]4s²
E) [Ne]3p⁴
19. Noble gas shorthand is used to:
A) Avoid writing inner electrons
B) Make atoms look more noble
C) Highlight ionization energy
D) Emphasize protons
E) Replace chemical symbols
20. Which element would have a noble gas configuration ending in 6s²?
A) Barium
B) Calcium
C) Magnesium
D) Strontium
E) Beryllium
- Questions on Hund's Rule and Orbital Filling Diagrams
- Questions on Electron Configurations
- Questions on Valence Electrons
Answers and Explanations
1. C – Noble gas configuration simplifies electron configuration using a noble gas core.
2. B – Sodium: 1s²2s²2p⁶3s¹ → [Ne]3s¹
3. B – Chlorine has 17 electrons; core configuration is [Ne]
4. A – Magnesium: [Ne]3s²
5. B – Bromine has 35 electrons → [Ar]4s²3d¹⁰4p⁵
6. B – Sulfur: atomic number 16 → [Ne]3s²3p⁴
7. A – Aluminum: 13 electrons → [Ne]3s²3p¹
8. C – Rubidium: 37 electrons → [Kr]5s¹
9. C – Calcium (Z=20) → [Ar]4s²
10. A – Potassium (Z=19) → [Ar]4s¹
11. D – All elements with 11–20 electrons use [Ne]
12. B – Gallium (Z=31) → [Ar]4s²3d¹⁰4p¹
13. A – Fluorine (Z=9) → [He]2s²2p⁵
14. A – This is the configuration of Xenon, a noble gas
15. A – Nitrogen (Z=7) → [He]2s²2p³
16. B – Calcium (Z=20) → [Ar]4s²
17. A – Iron (Z=26) → [Ar]4s²3d⁶
18. A – Sulfur (Z=16) → [Ne]3s²3p⁴
19. A – Noble gas shorthand saves time by skipping core electrons
20. A – Barium (Z=56) → [Xe]6s²
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