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Which outcome occurs when potassium's 4s orbital empties?

A)Increased spin polarization of surface
B)Enhanced electrical conductivity declines linearly
C)Reduced atomic radius and ionization
D)Diamagnetic susceptibility becomes more positive

💡 Explanation

The atomic radius decreases because effective nuclear charge increases; therefore, ionization energy rises sharply, rather than altering spin or bulk conductivity. The mechanism is electron shielding; reduced shielding from the 4s orbital leads to tighter binding.

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