Chemistry (please Help!!)

determine which experiences a lower effective nuclear charge. using words and/ or drawings explain why.
A) an electron in a 2s or an electron in a 2p
B) a valence electron on sulfure or a vance electron on silicon
C) a valence electron on chlorine or a valence electron on bromine

-- i don't get this at all! can somebody please explain this to me in detail. thank you!

asked by alia

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