30. Which two species are isoelectronic? c) Ca* and Mg2* a) Na* and K d) Al+ and

Question

30. Which two species are isoelectronic? c) Ca* and Mg2* a) Na* and K d) Al+ and Ne b) Cl and F e) P and Ca 31. How many electrons does a stable barium ion have? a) 2 c) 54 d) 56 e) 44 32. What is the electron configuration of Co+? a) [Ar] 3d 4s2 d) [Ar] 3d b) [Ar] 3d 4s2 e) [Ar] 3d c) [Ar] 3d 4s 33. Bond formation between nonmetals and nonmetals primarily involve a) interactions between protons c) transfer of electrons e) interactions between protons, electrons, and neutrons b) interactions between protons and electrons d) sharing of electrons 34. For which of the following pairs of species is the difference in size the greatest? b) Na and Mg e) O and F c) K and Br a) C and F d) Li and I 35. All of the following species have noble gas configurations EXCEPT b) P*. c) Ge+ a) K. d) I e) Kr. 36. The larger the difference in electronegativity 1. the more ionic the bond 2. the more covalent the bond 3. the more polar the bond a) only b) 2 only c) 3 onlyd and 3 only e) 2 and 3 only 37. The total number of valence electrons in the phosphate ion, PO,, is a) 24. b) 26. c) 28 d) 30 e) 32

Explanation / Answer

30.

isoelectronic --> same number of electrons

a)

can't be since they are in the same group

b)

can't be since they are in the same group

c)

can't be since they are in the same group

d)

this is the answer Al3+ will hve the same number of e- than Ne neutal

e)

different count of e-

Q31

Barium ion will form +2 typically

so

Ba normally = 56

when 2e- ar egone --> 56-2 = 54

choose C

Q32

CO3+ must have:

[Ar] 3d7 4s2 (cobalt alone)

when loses 3 e- ten

[Ar] 3d7 4s2

Co3+ --> [Ar] 3d6

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