题目内容

The electron configuration of element 25 is [Ar] 3d54s2, then it is in ( ) period of periodic table.

A. 2
B. 3
C. 4
D. 5

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If 180 g glucose (M=180 g/mol) is dissolved in 1 kg water. The magnitude of freezing point depression of this solution is ( ). (Kf=1.86 K•kg•mol-1)

A. 0.512 K
B. 1.86 K
C. 1.024K
D. 3.72K

What mass of NaCl is contained in 500 mL of a 0.200 mol/L NaCl solution?

A. 11.7 g
B. 5.85 g
C. 75 g
D. 58.5 g

Which one of the following signs is not right? ( )

A. 1s
B. 3p
C. 4f
D. 2d

Which energy is the highest? ( )

A. 3,2,+1
B. 3,1,0
C. 3,1,-1
D. 4,2,0