Explain this how to use those formulas give 2,3 examples

some examples

check this...how you can proceed for all these

2nd formula is wrong. please use formula provide by me

use this way shib

don't be confuse....first arrange the electron configuration in the proper way as given in the image then find the value of screening constant

you can't use this formula for exceptional configuration such as Cr, Cu

now you can apply these formula for those which are given in you booklet.

hope this will help you 🙏🙏

hope this will helps u shib😊🙏