please help me with these chemistry problems.

2008-04-07 12:11 pm
Your help is appreciated! thank you so much !

Hint : for every questions only requires one single answer
and the answers are all come from the periodic table!

41. is an ingredient along with iron and nickel in stainless steel
42. has 4 electrons in its 4P subshell
43. has a nuclear charge of 42+
44. is a group 16 (VA) element whose atomic mass is larger than the element after it in the periodic table
45.has a major use as a filament in incandescent light bulbs because of its high melting point .
46. is the most abundant naturally occurring radioactive element, used in many nuclear reactors.
47.is a greenish-yellow diatomic gas, produced by electrolysis of common salt.
48. has a nuclear charge of 25+
49. is the only non-metallic element that is a liquid at room temperature
50.is a halogen whose crystals sublime, giving a violet vapor.
51.is the major metal used in construction.
52. is often used to make coins, and one coin is commonly called by this name.
53.has 7 electrons in its 3d subshell
54. is located directly above osmium in the modern periodic table.
55. has a neclear charge of 45+
56. has 8 electrons in its 4d subshell
57. has the greatest density of any known element at 22.57 g/cm^3
58. has 77 protons in its nucleus
59. is an inert metal often used in electrodes and jewelry, and is more valuable than gold

回答 (1)

2008-04-08 6:01 am
✔ 最佳答案
41. chromium (Cr)
42. selenium (Se) ([Ar] 3d10 4s2 4p4)
43. molybdenum (Mo) (atomic number = 42)
44. tellurium (Te) (atomic masses : 51Te = 127.6, 52I = 126.9)
45. tungsten (W)

46. thorium (Th)
47. chlorine (Cl)
48. manganese (Mn) (atomic number = 25)
49. bromine (Br)
50. iodine (I)

51. iron (Fe)
52. nickel (Ni)
53. cobalt (Co) ([Ar] 3d7 4s2)
54. ruthenium (Ru)
55. rhodium (Rh) (atomic number = 45)

56. rhodium (Rh) (Rh: [Kr] 4d8 5s1) (Pd: [Kr] 4d10 is not 4d8)
57. osmium (Os)
58. iridium (Ir) (atomic number = 77)
59. platinum (Pt)


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