Which is the noble gas notation for chlorine?
A. [Ne] 4s^2 4p^5
B. [Ne] 3s^2 3p^5
C. [Ne] 3s^2 \cdot 3p^3
D. [Ne] 3p^3 3p^5
Answer (2)
Determine the electron configuration of chlorine: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 .
Identify the preceding noble gas: Neon (Ne) with electron configuration 1 s 2 2 s 2 2 p 6 .
Replace the neon configuration in chlorine's configuration with [Ne].
The noble gas notation for chlorine is [ N e ] 3 s 2 3 p 5 .
Explanation
Understanding the Problem The question asks for the noble gas notation for chlorine. We need to determine which of the given options correctly represents the electron configuration of chlorine using the noble gas that precedes it in the periodic table.
Electronic Configuration of Chlorine Chlorine (Cl) has an atomic number of 17. This means it has 17 electrons. The electronic configuration of chlorine is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 .
Electronic Configuration of Neon Neon (Ne) has an atomic number of 10. Its electronic configuration is 1 s 2 2 s 2 2 p 6 . This is the noble gas that precedes chlorine in the periodic table.
Noble Gas Notation for Chlorine To write the noble gas notation for chlorine, we replace the part of chlorine's electronic configuration that is the same as neon's with [Ne]. The electronic configuration of chlorine is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 . Since neon's configuration is 1 s 2 2 s 2 2 p 6 , we can replace this with [Ne]. This leaves us with 3 s 2 3 p 5 . Therefore, the noble gas notation for chlorine is [ N e ] 3 s 2 3 p 5 .
Final Answer The correct noble gas notation for chlorine is [ N e ] 3 s 2 3 p 5 .
Examples
Understanding electron configurations and noble gas notation is crucial in chemistry for predicting how elements will interact to form chemical bonds. For example, knowing the electron configuration of chlorine helps us understand why it readily forms a bond with sodium to create sodium chloride (NaCl), common table salt. The noble gas notation simplifies writing electron configurations, making it easier to visualize the valence electrons, which are the electrons involved in chemical bonding. This knowledge is also applicable in material science, where the electronic structure of elements determines the properties of materials.
The noble gas notation for chlorine is [Ne] 3s^2 3p^5. This notation summarizes chlorine's electron configuration while using Neon as the preceding noble gas. Thus, the correct answer to the question is option B.
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