I've attached an image of a periodic table to help you better understand.
First of all, there are four different types of sub-levels (s,p,d,f). Sub-level s can hold 2 electrons, p can hold 6 electrons, d can hold 10 electrons, f can hold 14 electrons.
Group 1 and 2 represents sub-level s, meaning that elements in group 1 and 2 will have an electron configuration ending with s.
Group 13-18 represents sub-level p, meaning that elements in group 13 to 18 will have an electron configuration ending with p.
Similarly, the area highlighted in green represents sub-level d, and the area separated below represents sub-level f.
Also, the period represents the energy level. For instance, group 1 and period 3 would be 3s. But, there are some exceptions. For sub-level d, you have to subtract 1 from the period number. Also, for sub-level f, you have to subtract 2 from the period number.
Now, knowing this, you can figure out the electron configuration. Start with Hydrogen, and then go through every elements by atomic number until it reaches the element you are trying to find the electron configuration of. Next, figure out which blocks/area did you go through. Afterwards, just lay out all the sub-levels in that order.
For example, if you are finding the electron configuration of chromium, follow the steps I written above. Then, you will get 1s2 2s2 2p6 3s2 3p6 4s2 3d4. Does this answer your question?
Hi, thank you for your question.
I've attached an image of a periodic table to help you better understand.
First of all, there are four different types of sub-levels (s,p,d,f). Sub-level s can hold 2 electrons, p can hold 6 electrons, d can hold 10 electrons, f can hold 14 electrons.
Group 1 and 2 represents sub-level s, meaning that elements in group 1 and 2 will have an electron configuration ending with s.
Group 13-18 represents sub-level p, meaning that elements in group 13 to 18 will have an electron configuration ending with p.
Similarly, the area highlighted in green represents sub-level d, and the area separated below represents sub-level f.
Also, the period represents the energy level. For instance, group 1 and period 3 would be 3s. But, there are some exceptions. For sub-level d, you have to subtract 1 from the period number. Also, for sub-level f, you have to subtract 2 from the period number.
Now, knowing this, you can figure out the electron configuration. Start with Hydrogen, and then go through every elements by atomic number until it reaches the element you are trying to find the electron configuration of. Next, figure out which blocks/area did you go through. Afterwards, just lay out all the sub-levels in that order.
For example, if you are finding the electron configuration of chromium, follow the steps I written above. Then, you will get 1s2 2s2 2p6 3s2 3p6 4s2 3d4. Does this answer your question?
Now I get it, Thank you!