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Questions and Answers
How many electrons are in an atom with the electron configuration of 1s^2 2s^2 2p^6 3s^1?
11
An atom has the electron configuration of 1s^2 2s^2 2p^5. How many electrons are in that atom?
9
What is the chemical symbol for the element that has the electron configuration described by the Aufbau diagram?
Al
What is the electron configuration of the element in period 2 that has 6 valence electrons?
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Using the periodic table, which of the following is the correct electron configuration of vanadium in its ground state?
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Using the following electron configuration of europium, how many principal energy levels are completely filled? 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^7
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Using the following electron configuration of europium, how many sublevels are occupied? 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 4f^7 5s^2 5p^6 6s^2
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What do all of the elements in a given horizontal row of the Periodic Table have in common?
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In an electron configuration code, superscripts placed on sub-levels indicate the number of _____
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The electronic configuration of carbon is 2,2,2.
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Each orbital designation has a superscript number that gives the number of _____ in that orbital sublevel.
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The ground state electronic configuration of _____ atom can be represented by nitrogen.
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What do the superscripts in an electron configuration represent?
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Which electron configuration is that of an element in the fourth period?
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The electron configuration of the neon atom is 1s^2 2s^2 2p^6.
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The electron configuration of the neon atom is 1s^2 2s^2 2p^6.
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The electron configuration 1s^2 2s^2 2p^6 3s^2 3p^4 corresponds to phosphorus.
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Study Notes
Electron Configuration Fundamentals
- Electron configuration describes the distribution of electrons in atomic orbitals.
- Superscripts indicate the number of electrons in a given sub-level.
Key Electron Configurations
- Configuration for element with 11 electrons: 1s² 2s² 2p⁶ 3s¹.
- Configuration for element with 9 electrons: 1s² 2s² 2p⁵.
- Electron configuration of Vanadium: [Ar] 4s² 3d³.
- Electron configuration for phosphorus: 1s² 2s² 2p⁶ 3s² 3p⁴ is incorrect; it does not correspond to phosphorus.
Valence Electrons and Periodic Trends
- Elements in the same horizontal row (period) of the Periodic Table share the same number of occupied principal energy levels.
- Element in Period 2 with 6 valence electrons: 1s² 2s² 2p⁴.
Energy Levels and Sublevels
- Europium configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷ has 3 completely filled principal energy levels.
- Sublevels occupied by Europium: 13.
True/False Statements
- The electronic configuration of carbon is not 2,2,2; it is incorrect.
- The electron configuration of neon (1s² 2s² 2p⁶) is true.
Miscellaneous
- Each orbital's superscript indicates the number of electrons within that sublevel.
- Nitrogen's ground state electron configuration can be represented, aligning with the rules of electron filling.
Important Definitions
- Sublevel: A subdivision of a principal energy level in an atom.
- Valence Electrons: Electrons that are in the outermost shell and determine an element's chemical properties.
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Description
Test your understanding of electron configurations and their significance in atomic structure. This quiz covers the key configurations, valence electrons, and how they relate to periodic trends. Perfect for students studying chemistry or preparing for exams.
