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What is the electron arrangement of calcium? 2-8-10?

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What is the electron arrangement of calcium? 2-8-10?

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  1. if the count is  20 then yeah.


  2. no it is 2,8,8,2

  3. No 1s2 2s2 2p6 3s2 3p6 4s2  (with your writing 2-8-8-2)

    explanation :  the energy of subshell 4s is lower than that of subshell 3d, so subshell 4s is filled before the subshell 3d)

  4. 2882

    1s2[(2s2)2p6]{(3s2)(3p6)}4s2

    the 4th shell starts before the third packs more densely
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