Asked by Mrs. Brisco

assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff for Cl and K.
Answered by DrBob222
If I read this right, K = 19+ - 18 core = 1+ = Zeff.

Cl^- = 17+ - 18 = -1 = Zeff.
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