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元素电负性随原子序数的递增而增强的是
A．Na K Rb B．N P As C．O S Cl D．Si P Cl
A．Na K Rb B．N P As C．Si P Cl D． O S Cl
A．Na > K > Rb B．N > P > As
C．O > S > Cl D．Si > P > Cl