Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Can someone help me out with energy levels?
So ive been told the energy levels are
2)8)8)8)...
But now im getting told that they are
2)8)18)32) which is confusing...
Also if they were 2)8)18)32
Why does calcium not follow that rule?
1 Answer
- Simonizer1218Lv 75 years ago
Energy levels are 1, 2, 3, 4, 5, 6, 7, etc. These are the principle quantum numbers. If you are asking about electrons in each energy level, then it is 2n^2. So, for the first energy level (n=1) there are 2 electrons. For second energy level (n=2) there are 8 electrons. Third energy level (n=3) there are 18 electrons, and so on. The electron configuration for calcium (at.no. 20) is 1s2 2s2 2p6 3s2 3p6 4s2. The reason it doesn't "follow the rule" is because the 4s subshell fills before the 3d, so the 3rd energy level doesn't get its full compliment of electrons until zinc, which does have 18 electrons in the 3rd energy level.
