21) In which list are the ions arranged in order of decreasing size? a) S-2, Br-, K+, Ca+2 b) Br-, S-2, K+, Ca+2 c) K+, Ca+2, S-?, Br- d) Ca+2, K+, S-2, Br-

Ok where is the image ?

The answer for this is a

Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.

"electrical energy" transforms to "thermal energy".hope my answer has you : )