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Effective nuclear charge increases across a period. This is justified because number of protons increase in nucleus across a period, and there's no change in the number of "shielding" electrons. However, wouldn't valence electrons repulse each other? Why does this repulsion not seem to matter for effective nuclear charge?

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  • $\begingroup$ for those who haven't seen it before (I hadn't, at least not recently) i.stack.imgur.com/8pKaH.png $\endgroup$ – uhoh Feb 7 at 7:02
  • $\begingroup$ They do, it's a reasonable approximation because valence electrons occupy a common shell further from the nucleus than the core electrons. $\endgroup$ – Buck Thorn Feb 7 at 8:51

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