Chemistry, asked by aryan36690, 1 year ago

why iron has 14 electrons in third shell

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Answered by IAMHELPINGYOU

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1st shell can contain a maximum of 2 electrons
2nd shell can contain a maximum of 8 electrons
3rd shell can contain a maximum of 8 electrons
4rd shell can contain a maximum of 8 electrons

$Atomic \:number \:of \:iron = 26$
therefore, its electronic configuration = 2, 8, 8, 8

It has 8 electrons in the third shell not 14

aryan36690: then you tell why Fe has electronic configuration of 2,8,14,2

aryan36690: https://goo.gl/images/wWyRzo

aryan36690: i actually don't know what is correct. just using my sense.

aryan36690: We can fill max 18 e- in 3rd shell .2n^2 formulae

IAMHELPINGYOU: but the outermost shell can have a max of 8 electrons

IAMHELPINGYOU: 18 is the total no. of electrons

aryan36690: 26 electrons are present in iron.Ar has 18 e-

IAMHELPINGYOU: 2 electrons in the first shell, 8 electrons in the 2nd shell, 8 electrons in 3rd shell, 8electrons in the 4th shell

aryan36690: go through afbau

aryan36690: it is an element,not a noble gas

Answered by Anonymous

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The figure shows 12 in the 3rd and 2 in the 4th. The term shell is probably inappropriate as there was a model of Bohr which used the term "shell" to correspond to "periods" in the periodic table. As for the reason? There is nothing that requires an energy level to fill up before another one starts to fill. Its all about stability and energy. It depends on many factors. Transition metals will almost always have 1 or 2 electrons in the s sublevel above the d sublevel that corresponds to its place in the d block

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$\orange{hope\:it\:helps}$

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