{"id":45895,"date":"2025-07-01T13:56:00","date_gmt":"2025-07-01T13:56:00","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=45895"},"modified":"2025-07-01T13:56:02","modified_gmt":"2025-07-01T13:56:02","slug":"what-is-the-electron-configuration-for-the-cobalt-co-atom-in-its-ground-state","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/what-is-the-electron-configuration-for-the-cobalt-co-atom-in-its-ground-state\/","title":{"rendered":"What is the electron configuration for the cobalt (Co) atom in its ground state"},"content":{"rendered":"\n
What is the electron configuration for the cobalt (Co) atom in its ground state? a. 1s22s22p63s23p63d7 b. [Ar]3d7 c. 1s22s22p63s23p63d74s2 d. [Kr]4s23d7 2. Corrected_text: What is the electron configuration for the calcium (Ca) atom in its ground state? a. 1s22s22p63s23p63d64s2 b. [Ar]4s2 c. 1s22s22p63s23p63d2 d. [Kr]4s2 3. Corrected_text: Which ion has the ground-state electron configuration: 1s22s22p63s23p4? Check all possible. a. P- b. Cl- c. S2- d. Ar2+ 4. Corrected_text: The ground-state electron configuration of the Sb3- ion is: a. [Kr]4d105s25p6 b. [Kr]5s25p6 c. [Kr]4d105s25p6 d. [Kr]4d105s2<\/p>\n\n\n\n
The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n
. Electron configuration of Cobalt (Co) atom in its ground state<\/strong><\/h3>\n\n\n\n
The atomic number of cobalt (Co) is 27<\/strong>, meaning it has 27 electrons in its neutral state. The electron configuration can be written by filling the orbitals in the order of increasing energy, following the Aufbau principle, Hund’s rule, and Pauli exclusion principle. Here’s the step-by-step breakdown:<\/p>\n\n\n\n
\n
First, the 1s orbital is filled with 2 electrons: 1s\u00b2<\/strong>.<\/li>\n\n\n\n
Then, the 2s orbital is filled with 2 electrons: 2s\u00b2<\/strong>.<\/li>\n\n\n\n
The 2p orbital can hold 6 electrons: 2p\u2076<\/strong>.<\/li>\n\n\n\n
The 3s orbital is filled with 2 electrons: 3s\u00b2<\/strong>.<\/li>\n\n\n\n
The 3p orbital is filled with 6 electrons: 3p\u2076<\/strong>.<\/li>\n\n\n\n
Now, we move to the 3d orbital, which holds 7 electrons for Co: 3d\u2077<\/strong>.<\/li>\n<\/ul>\n\n\n\n
Thus, the electron configuration for the ground state of cobalt is: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2077 4s\u00b2<\/strong>.<\/p>\n\n\n\n
So, the correct answer is c. 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 3d\u2077 4s\u00b2<\/strong>.<\/p>\n\n\n\n
2. Electron configuration of Calcium (Ca) atom in its ground state<\/strong><\/h3>\n\n\n\n
The atomic number of calcium (Ca) is 20<\/strong>, meaning it has 20 electrons. The electron configuration follows the same process as for cobalt:<\/p>\n\n\n\n
\n
First, the 1s orbital is filled with 2 electrons: 1s\u00b2<\/strong>.<\/li>\n\n\n\n
The 2s orbital is filled with 2 electrons: 2s\u00b2<\/strong>.<\/li>\n\n\n\n
The 2p orbital holds 6 electrons: 2p\u2076<\/strong>.<\/li>\n\n\n\n
The 3s orbital holds 2 electrons: 3s\u00b2<\/strong>.<\/li>\n\n\n\n
Finally, the 4s orbital holds the remaining 2 electrons: 4s\u00b2<\/strong>.<\/li>\n<\/ul>\n\n\n\n
Thus, the electron configuration for the ground state of calcium is: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2<\/strong>.<\/p>\n\n\n\n
So, the correct answer is b. [Ar] 4s\u00b2<\/strong>. This is the shorthand notation, where [Ar]<\/strong> represents the electron configuration of Argon (18 electrons) and 4s\u00b2<\/strong> is added.<\/p>\n\n\n\n
3. Ion with the electron configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2074<\/strong><\/h3>\n\n\n\n
This configuration corresponds to an element that has 18 electrons in total (since 2 + 2 + 6 + 2 + 4 = 18). This configuration is typical for the S\u00b2\u207b<\/strong> ion, as sulfur (S) has 16 electrons in its neutral state, and by gaining 2 electrons (to become S\u00b2\u207b), it reaches the electron configuration of Argon.<\/p>\n\n\n\n
\n
P\u207b<\/strong>: Phosphorus has 15 electrons, so it would need to gain 3 electrons to have 18, so this does not match.<\/li>\n\n\n\n
Cl\u207b<\/strong>: Chlorine has 17 electrons, and by gaining 1 electron, it would also reach 18 electrons, so this is a possible match.<\/li>\n\n\n\n
S\u00b2\u207b<\/strong>: Sulfur, as explained, gains 2 electrons to achieve this configuration, so this is also a correct match.<\/li>\n\n\n\n
Ar\u00b2\u207a<\/strong>: Argon has 18 electrons, and the Ar\u00b2\u207a ion would have lost 2 electrons, making this configuration incorrect.<\/li>\n<\/ul>\n\n\n\n
Thus, the ions with the ground-state electron configuration 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2074<\/strong> are Cl\u207b and S\u00b2\u207b<\/strong>. So, the correct answers are b. Cl\u207b<\/strong> and c. S\u00b2\u207b<\/strong>.<\/p>\n\n\n\n
4. Electron configuration of Sb\u00b3\u207b ion<\/strong><\/h3>\n\n\n\n
The atomic number of antimony (Sb) is 51<\/strong>, and in its neutral state, it has 51 electrons. The electron configuration of Sb in its neutral state is:<\/p>\n\n\n\n
So, the correct answer is a. [Kr] 4d\u00b9\u2070 5s\u00b2 5p\u2076<\/strong>.<\/p>\n\n\n\n<\/figure>\n","protected":false},"excerpt":{"rendered":"
What is the electron configuration for the cobalt (Co) atom in its ground state? a. 1s22s22p63s23p63d7 b. [Ar]3d7 c. 1s22s22p63s23p63d74s2 d. [Kr]4s23d7 2. Corrected_text: What is the electron configuration for the calcium (Ca) atom in its ground state? a. 1s22s22p63s23p63d64s2 b. [Ar]4s2 c. 1s22s22p63s23p63d2 d. [Kr]4s2 3. Corrected_text: Which ion has the ground-state electron configuration: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45895","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/45895","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=45895"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/45895\/revisions"}],"predecessor-version":[{"id":45897,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/45895\/revisions\/45897"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=45895"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=45895"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=45895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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