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La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table. Write down the general outer electronic configuration of the ten elements from La to Hg together using orbital notation method. |
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Answer» i. La and Hg both belongs to period 6. Therefore, n = 6. ii. Elements of group 3 to group 12 belong to the d-block of the modem periodic table. iii. The general outer electronic configuration of the d-block elements is ns0-2 (n -1 )1-10. iv. Therefore, the outer electronic configuration of all ten elements from La to Hg is as given in the table below.
[Note : There are 14 elements between La and Hf which are called lanthanides. Therefore, After La, electrons are filled in 4f subshell of lanthanide elements. Once all the 14 elements of lanthanide series are filled, next electron enters 5d subshell of Hf. Hence, The outer electronic configurations of Hf to Hg often include completely filled 4f subshell. For example, the electronic configuration of Hf '5d26s2' can also be written as '4f145d26s2'.] |
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