题目内容

下列各组元素按原子半径由大到小排列正确的是( )

A. Mg>B>Si
B. Si>Mg>B
C. Mg>Si>B
D. B>Si>Mg

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下列各组元素按第一电离能大小排列正确的是( )

A. C>B>Be
B. O>N>C
C. F>N>O
D. N>O>F

The energy of an orbital in a many electron depends on( )

A. n
B. n 、l
C. n 、l 、m
D. n 、l 、m 、ms

Which one has the smallest radius among following particles? ( )

A. K+
B. Ar
C. S2-
D. Cl-

An ion with five unpaired electrons in its ground state is? ( )

A. Cr3+
B. Fe3+
C. Mn3+
D. Ni2+