Problem

Write the electron configuration for the monatomi…

06:18

Problem 7 Medium Difficulty

Write the electron configuration for each of the following ions:
(a) As3–
(b) I–
(c) Be2+
(d) Cd2+
(e) O2–
(f) Ga3+
(g) Li+
(h) N3–
(i) Sn2+
(j) Co2+
(k) Fe2+
(l) As3+

Answer

(a)
Arsenic (As) gains three electrons to form arsenide ion $\left(\mathrm{As}^{3}\right) .$ The neutral atom has 33
electrons; the arsenide ion has gained 3 electrons and has 36 electrons. The electronic
configuration of arsenide ion is the same as that of krypton. The electronic configuration of
arsenic is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{s}^{2} 3 \mathrm{d}^{10} 4 \mathrm{p}^{3} $ and arsenide ion is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{s}^{2} 3 \mathrm{d}^{10} 4 \mathrm{p}^{6}$ or
$[\mathrm{Ar}] 4 \mathrm{s}^{2} 3 \mathrm{d}^{10} 4 \mathrm{p}^{6}$
(b)
lodine (I) gains an electron to form iodide ion (I) which is very stable because it obeys the
octet rule. lodine has 53 electrons by gaining an electron it becomes iodide ion the number of
electrons is 54 which is the same as the number of electrons in xenon. The electronic
configuration of iodide ion is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{6} 4 \mathrm{d}^{10} 5 \mathrm{s}^{6}$ or $[\mathrm{Kr}] 4 \mathrm{d}^{10} 5 \mathrm{s}^{2} 5 \mathrm{p}^{6}$ .
(c)
Beryllium (Be) has 4 electrons and its electronic configuration is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2}$ . By losing 2 electrons
it attains the configuration of helium. The configuration of $\mathrm{Be}^{2+}$ ion is 1 $\mathrm{s}^{2}$ .
(d)
Cadmium (Cd) has 48 electrons and its electronic configuration is
1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{2} 4 \mathrm{p}^{6} \mathrm{fs}^{2}$ . Cadmium has lost 2 electron to form $\mathrm{Cd}^{2+}$ and it has
46 electrons, its electronic configuration is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{2} 4 \mathrm{p}^{6} 4 \mathrm{d}^{10}$
(e)
Oxygen has 8 electrons and by gaining 2 electrons, i, becomes oxide ion which has
10 electrons which is the same as that of neon. The electronic configuation of oxide ion is
$15^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6}$ .
(f)
Gallium has 31 electrons which has the electronic configuration of
1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{2} 4 \mathrm{p}^{1}$ . By losing three electrons it becomes $\mathrm{Ga}^{3+}$ ion which has 28
electrons. The electronic configuration of $\mathrm{Ga}^{3+}$ is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10}$ .
(g)
Lithium has 3 electrons and when it loses an electron, it becomes lithium cation which has only
2 electron which is the same as that of helium. The electronic configuration of $\mathrm{Li}^{+}$ is 1 $\mathrm{s}^{2}$ .
(h)
Nitrogen has 7 electrons. It gains 3 electrons to form $\mathrm{N}^{3-}$ ion and the total number of electrons
will be $10 .$ The electronic configuration of nitride ion $\mathrm{N}^{3-}$ is same as that of neon. The electronic
configuration of $\mathrm{N}^{3-\text { is }}$ ls $^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6}$ .
(i)
Tin has 50 electrons. It gains 2 electrons to form $\mathrm{Sn}^{2+}$ ion which has 48 electrons. The
electronic configuration of $\mathrm{Sn}^{2+}$ is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{s}^{2} 3 \mathrm{d}^{10} 4 \mathrm{p}^{6} 5 \mathrm{s}^{2} 4 \mathrm{d}^{10}$ or $[\mathrm{Kr}] 5 \mathrm{s}^{2} 4 \mathrm{d}^{10}$
(j)
Cobalt has 27 electrons; it loses two electrons to form $\mathrm{Co}^{2+}$ which has 25 electrons, the same
as that of manganese and the electronic configuration of $\mathrm{Co}^{2+}$ is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{7}$ .
(k)
Fe $^{2+}$ has 24 electrons. It loses 2 electrons to form $\mathrm{Fe}^{2+}$ ion and its electronic configuration is
1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{6} 4 \mathrm{s}^{2}$ . The electronic configuration of $\mathrm{Fe}^{2+}$ is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{6}$ .
(l)
Arsenic has 33 electron. Its electronic configuration is 1 $\mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{2} 4 \mathrm{p}^{3}$ . It loses its
3 electrons to form $\mathrm{As}^{3+}$ ion and its electronic configuration is $\operatorname{ls}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{d}^{10} 4 \mathrm{s}^{2}$ .

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Discussion

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Catherine A.

October 26, 2020

Finally, the answer I needed, thanks Anupa M.

Catherine A.

October 26, 2020

Annupa, thanks this was super helpful.

Mohammed A.

February 2, 2021

Electron configuration of the element s2-

Mohammed A.

February 2, 2021

Electron configuration of the element s2-

Mohammed A.

February 2, 2021

Anfela O.

June 29, 2021

What is the bond order of Be2+

Anfela O.

June 29, 2021

What is the bond order of Be2+

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Video Transcript

here. The question is about to turn contribution, right? The little contribution for each of the following irons. Now I am circular in here just by foreigners position in the minority. But you can understand what is a Tony contribution. So first of all say, for example, you are taking their 1st 1 That is e arsenic humility. Now, what is the position off it in the pillory table? It is at this position. Here is arsenic. That means the group number is 50 on and the period number is full. This period number is actually directly giving you the outer shape which is field by electrons on. And what is the nearest No. Well, guess it is a so upto air. The conflagration is not disturbed. So you can write that you are here. That means the literally conflagration up to here with the S in e r. Argon. After that, you have to write the position off our most of that is the food s So you're writing for s for as to and then t d td Lipton's are feeling here so you can read TD after feeling for us. We're feeling tedi so really completely food because it is member off be bloke element. So treaty 10 on. After that, you're feeling therefore be orbital's on this four b Orbital's three more little if it is neutral atom, then it should have people be to LGBT. But the morning, John that since it should be six So you're writing literally conflagration. Be six. So this is the outermost, literally conflagration off a that is Yes, Tina. Gritty. Now go to be B. Is I negative? I only negative. So I'll write on I already in position is here right in the 17th group. You know the position off roading. This is hell Virgin. Okay, after that, what is the nearest a noble guests? It is the g r. So you're writing in the bracket that a rookie are the attorney conflagration reading in seeing as in gear after that, your supposition is fine. Five period. That means fine as to so you're writing fine as to after that forties already. Field thesis treaty. And this should be 40 so forties already freed. So you're waiting for be 10 and then five p or Dallas field because it is, uh, member off people. Okay, elements. And if it is here. It should be five. But here one morning patrol. That means it is negative, sir. So when will you get on the stick? And bite Said should be six. So the outermost 25 being so. This is the literal contribution off be now come to see. See is beryllium baby? Um two plus Nobel. Liam Ryan is total number off. Veterans are for it is here in the second cope And from that memorial tonsils removed That means from the two s are today more little Sally mode. So it is left to lean on. Only one has to. That is exactly like here. Now go do this D can you Hopeless when it is cadmium two plus again You're searching your supposition in the pillory Differ on Get me um is here in the deep look elements on dhe here also, you are looking for the nearest noble guests. That is good turn So hooked on a took it on the electronic contribution meeting in scene as in Clinton. So you're writing it in the bracket on after that? It is the member off five s. What are we doing? So fine as should be the other most for every day. And then fool for D is completely filled. It is member off, well, segments for days, completely fleet, so it should be dead. Full d 10 on the outermost are electrons are removed to little Sally nude that should be removed from the file Assad Little so it should be fine. A serial. That is how they literally conflagration off gaming group lis. No oxygen unit. When it is oxygen to nobility, you know its position in the periodic table that is this one 16th group and secondly, it so you're still a Tony contribution. Total number off the drones are eight only. So no need to write to the Helio conflagration on you can just write it is oneness to it was too. No reason if it is, mutilate them in Children before. But moral Aton is indicated by these tuna. Until charge on that is the ideal attorney contradiction should be this one. Ruby six. Free, then effort is Gilliam three plus Gilliam T. Plus. What is your special in the Nordic devil that you have learned first on the stand first on Gilliam G's somewhere here? This is really it is member off B block element and talking group on fourth Idiot. So you're saying Tony contribution should be beaten after argon organised on the arrest? No way, Vegas. So it should be in the Breck it argon. And after that, you're already it is three d din, then four s. It should be, if it is futile damage before us too. Four people but here till it turns out more first from the really orbit. And then from the four s orbit. So four b is also zero. And first you're right in the s or Riddle. So here your moment did. This should be for essence, you know? And then for busy so out, early Tony conflagration of GMT Plus should be are gonna after that to detain or sinking. Right? So in the next one, G g is leaking. Gideon position is known. Nurse position is here in the first group and second billet Total number of Littles. We know it is tea on Dwell one electron is removed along. You were getting a little plus so we can write your cell It only confirmation should be, but it's Tony toe s one and detonate on this route No, it's tch Anti nudity, nitrogen ease in 15 group and in second beat. So you're saying it only contribution And three more Little So first we're right in the night. Reason it only contribution That should be one s two to a stew door. May t if it is 15 group that missed the order should have tea. So that is the neutral atom. But it is taking except meeting early tone. And by that only industry. Negative. So total number of electrons in the fjord six. So this is the most of it. Only contribution. Oh, off on this end, three negative, then come toe. I is a sin to plus Essen troopers as in position is here. Yeah, in the 14th group and bigger numbers clave. So accordingly you can write, Dear Sillitoe contribution. The nearest nobody has history done. So you're writing down first and after that four is complete. So you're writing Corby Gen Then find s or we do. Is there as two is already complete on DDE it is. Guns should be in the bureau in the neutral atom. But this Doolittle's are first removed. So five p orbital's. I should not have any electron Truly trance from here. The suit. So you can write five PCU no country G for governor position. You notice tradition today. SOCO bodies here. When you know the position off covert, then you can write yours out early, Tony. Confirmation or upto organ? It will do. You mean scene? So you're writing argon first in the bracket and after that four s orbital should be field first. But when it discovered Do Plus for s electrons are so and t d orders are freed when it is a member off nine that Steven toe detained Here it is fate. So this should be said e 9 10 So here it should be sellin soco are Googlers should have really soundly After that we're going to f e two Plus that is okay. Every two plus is again tradition Metal on your supposition is here. So, Effie, out early, Tony, Conservation is that in argon? So you're writing argon After that? It should be four s too, but you'll atone suddenly moved that it should be removed from the That's all. We don't so four as you do and three D should be here up to here. It is six. So you're writing 67 conceal from the oneto detail we're feeling in the DDR. Dance or diligence? When this is the group number eight, that means total six electrons must be presently. Now, come do the last one. If a that is arsenic. Sleepless arsenic, dribblers. Arsenic is here. Your position. Arsenic is here and are cynical. Argon is the outermost. I got a bloody good you're turning. Conflagration will be common after that. Three d little is complete, sir. You're writing t d 10 and then full s electrons clean. Plus, so four s a little wilder. Women seem who is too. But all the being late on steel turns in the yard until they are removed to make it three plus so four b should be zero. So that is how you already melatonin contribution Just fine. Vineyards position in the pillory on knowing that time in case of Catan daily transit removed and in Gaza. And I really should be at it

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