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Question

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Identify the element whose ions have the following electronconfigurations. How many unpaired electrons does each ion contain?(Type your answer using the format [NH4]+ forNH4+.)
(a) a 1+ ion with [Xe]4f145d106s2
symbol

unpaired electrons


(b) a 3+ ion with [Ar]3d1
symbol

unpaired electrons

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Write the electron configuration for the following ions. How manyunpaired electrons does each contain? (Type your answer using theformat [Ar] 4s2 3d10 4p2 for[Ar]4s23d104p2.) (c) Si2-ion
electron configuration

unpaired electrons


(d) Mn2+ ion
electron configuration

unpaired electrons



(a) a 1+ ion with [Xe]4f145d106s2
symbol

unpaired electrons


(b) a 3+ ion with [Ar]3d1
symbol

unpaired electrons

------------------------------------------------------------------------------------------------
Write the electron configuration for the following ions. How manyunpaired electrons does each contain? (Type your answer using theformat [Ar] 4s2 3d10 4p2 for[Ar]4s23d104p2.) (c) Si2-ion
electron configuration

unpaired electrons


(d) Mn2+ ion
electron configuration

unpaired electrons


(c) Si2-ion
electron configuration

unpaired electrons


(d) Mn2+ ion
electron configuration

unpaired electrons

Explanation / Answer

(a) a 1+ ion with [Xe]4f145d106s2 Since it is a 1+ ion , adding an electron will give the neutralatom. i.e. [Xe]4f145d106s26p1 This the configuration of Thallium - Tl. It has 1 unpaired electron. . (b) (b) a 3+ ion with[Ar]3d1 Adding 3 electrons , we get [Ar]3d2 4s2 This is the configuration of Titanium. It has two unpaired electrons. . (c) (c) Si2-ion [Ne] 3s2 3p4 There are two unpaired electrons in the p sublevel . (d) Mn2+ ion [Ar] 3d5 There are 5 unpaired electrons.

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