Question

what element is [Kr] 5s^2 4d^10 5p^4

Answer 1

just reading the periodic table....

Answer 2

What they are doing is from the element of the unknown they are basically counting the separate block of the periodic table which are the s block, d block. p block and the f block

Answer 3

and they count all the way up until they get to the first noble gas which was Kr

Answer 4

then you start the counting backwards, the 5 row of the s block is full, the the d block is full, then you hit the p block and it is not full so you count the 4 block which leads you to Te..