29 Consider the ions indicated by I- IV and decide which of the possible electro

Question

29 Consider the ions indicated by I- IV and decide which of the possible electron configurations indicated by choices a -1 correctly describes the proper electron configuration. Some of the choices may match more than one statement or none of the statements Ion I. N II K 111. T?3- IV. S2 Choices a. 1s22s22p b. 1s22s22ps or [Ne] c. Is2282p 3sl or [Ne]3s' g. 1s?2s22p 3s 3p 4s' or [Ar]4s i.1s2282p 3s23p 4s23d' or [Ar]4s23d' Ar]4s 3d f. 1s22s22p 3s3p° or [Ar] 1. 1s 2s 2p 3s 3p 3d1 or [Ar]3d A) I: a B) I: b C) I: b D) I: a E) I: b II: g II: f 11: f II: g Il: f IV. e IV. f Iv.f IV. e IV. f

Explanation / Answer

I) ion N3-

N + 3e- -----> N3-

atomic number of N is 7

electronic configuration of N is 1s22s22p3

electronic configuration of N3- is 1s22s22p6 or [Ne] ---------- (b)

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II) ion K+

K ------> K+ + 1e-

electronic configuration of K is 1s22s22p6 3s23p6 4s1 or [Ar]4s1

electronic configuration of K+ is 1s22s22p6 3s23p6  or [Ar]    ---------- (f)

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III) ion Ti3+

Ti ------> Ti3+ + 3e-

electronic configuration of Ti is 1s22s22p6 3s23p6 4s23d2 or [Ar]4s23d2

electronic configuration of Ti3+ is 1s22s22p6 3s23p6 3d1 or [Ar] 3d1    ---------- (l)

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IV) ion S2-

S + 2e- ------> S2-

electronic configuration of S is 1s22s22p6 3s23p4 or [Ne] 3s23p4

electronic configuration of S2- is 1s22s22p6 3s23p6  or [Ar]    ---------- (f)

hence correct iption is

(E) I: b II: f III: l IV: f

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