Electron Shell model shows. This thread is archived. the seconds n=2 shell holds 8 electrons. It can have 18 electrons only when N shell contain minimum 1 electron. hide. 3 Answers. This is why the electronic configuration of calcium is 2, 8, 8, 1 and not 2, 8, 9, 1. the clarification at the back of it is that, the d block factors have (n-a million)d subshell. This is because of Afbau’s principle which states that electrons fill orbitals starting at the lowest available (possible) energy levels before filling higher levels (e.g. So what happens in calcium is that 8 of the remaining 10 electrons are in the 3rd shell, and the other 2 are in the 4th shell. 71% Upvoted. Why don't libraries smell like bookstores? New comments cannot be … For which other elements does the 3rd energy level only hold 8 electrons and not 18? Why is it that the electron configuration for calcium is 2, 8, 8, 2 and not 2, 8, 10? Can someone explain why calcium has 8 electrons and scandium has 9 in the third shell(why cant calcium also have 9).And also how many electrons can be in every energy level. … But after calcium, due to the presence of d block, things change and then the third shell can hold a maximum of 18 electrons. 8 8. comments. the seconds n=2 shell holds 8 electrons. share. If you are 13 years old when were you born? yet after calcium, because of the presence of d block, issues replace and then the third shell can carry a optimal of 18 electrons. I thought that the 3rd shell could hold a maximum of 18 electrons so why must the other 2 electrons be at the 4th shell? It shouldn't surprise you that calcium has a valence of 2. Why calcium's 3rd shell only has 8 electrons and the 4th shell, 2 electrons? Upto calcium, the third shell can carry purely a optimal of 8 electrons. save. The reason behind this is that, the d block elements have (n-1)d subshell. Calcium has 20 electrons so they are arranged 2. are arranged in different shells around the nucleus. Find an answer to your question Electronic configuration of Potassium is 2,8,8,1 and Calcium 2,8,8,2, when M shell can have maximum of 18 electrons then why … ... it has to have 2 valence electrons. Its electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 instead of 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 4s 1.. because M-shell can aquire maximum 18 electrons but due to octet rule it has only 8 electrons in potassium and calcium. The third shell carries on filling up only after 2 electrons are in the 4th shell. Yes, calcium is defined as a metal because of both its physical and chemical traits. They all have an outer shell with two electrons and are very reactive. Even though the M shell has the capacity to hold 18 electrons it cannot hold more than eight electrons. Answer Save. So, in potassium and calcium elements, M-shell contains 8 electrons respectively and N shell contains 1 and 2 electrons respectively. Upto calcium, the third shell can hold only a maximum of 8 electrons. the third n=3 shell holds 18 electrons. the first n=1 shell holds 2 electrons. However, the third shell only holds 8 electrons before the fourth shell starts to fill. Why couldn't the 3rd shell hold 10 electrons? report. Those elements in the second column have two electrons ready to make compounds. Thus as soon as the number of electrons in the M shell exceeds eight, the filling of the next shell ( that is N) takes place. Is calcium special? Therefore the electron configuration of calcium should be 1s2 2s2 2p6 3s2 3p6 3d2 but why is the electron configuration of calcium 1s2 2s2 2p6 3s2 3p6 4s2 Calcium has 20 electrons and m shell is a 3rd energy level.
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