思考题与讨论题

23. Which of the following represents a reasonable set of quantum number?

 A. 2,2,2,( +1/2)    B.2,2,1,( +1/2)    C.4,2,3,(+1/2)    D.2,0,0,(+1/2)

24. An element,X,has the electronic configuration 1s'2s'2p3s'3p’. The formula of the most probable compound this element will form with Ca is

A.Ca X    B.CaX    C.Ca X,   D.CaX   E.CaX

25. Which of the following atoms has the largest number of unpaired electrons in its ground state configuation?

A.Ag    B.Cd   C.Sn   D.Mo  E.Co

26. The ground state electronic configuation of Fe³⁺ is

A. [Ar]3d³4s²  B. [Ar]3d⁶4s²   C.[Ar]3d⁵  D. [Ar]3d⁴4s¹     E. [Ar]3d⁶

27. The correct order for decreasing atomic radius of the five atoms H,Br,I,He, Cl is

A.Br>I>He>CI>H     B.I>Br>CI>He>H      C.CI>Br>I>H>He  

D.I>Br>CI>H>He     E.I>Br>He>CI>H

28. The atom with lowest atomic number and a completely filled 3d subshell in the ground state is

A.Cu   B.Ar    c.Cr    D.Zn     E.Kr 

29. An ion with five unpaired electrons in its ground state is

A.Cr3+   B.Fe3+ C.Mn3+ D.Ni2+  E.Cu2+  

30. The atom with lowest atomic number that has a ground state electronic configuation ofis in the

A.2nd period  B.3rd period  C.4th period  D.5th period  E.6th period