miffmoff replied to your post: miffmoff replied to your post: miffmoff replied to…
Sorry its me not being clear, 4s fills before 3d so its at lower energy than 3d putting 3d just under 4p allowing 3d to shield 4p and not 4s
ahhh, yes I get it now. :) Thanks. I’m being dumb and going ‘shielding’ but not registering that it’s from the nucleus.