anonymous
  • anonymous
4.What is the electron configuration of the element with 27 protons? please me
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I put 3 and it wasn't right
Photon336
  • Photon336
Have to start like this 1s^2 2s^2 2^p^6 3s^2 3p^6 4s^2 3d^7 The electronic configuration of cobalt is :1s2 2s2 2p6 3s2 3p6 3d7 4s2 This is so because cobalt has an atomic no of 27. So it will have 27 electrons. The 1st shell can accommodate a maximum of 2 electrons, the 2nd shell can have 8. So that makes it 10, 17 Now the 3s and 3p subshells get filled up with 2 and 6 electrons respectively, but after that instead of the 3d subshell, the 4s subshell gets filled up.(This is so because the 4s subshell has a lower energy level than 3d). So that makes it 20 electrons. The remaining 7 proceed into the 3d subshell to get a total of 27.
Rushwr
  • Rushwr
I agree

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anonymous
  • anonymous
Thanks

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