sos,明天要交作业了

题目

sos,明天要交作业了
Answer the following questions.
1.What is the difference between the transition metals and the inner transition metals?
2.Write the electron configAurations for titanium (Ti),vanadium (V),chromium (Cr),and
manganese (Mn).
3.Which of the elements listed in question 2 would be the hardest?Which would have the
highest melting and boiling points?Why?
4.Which of the elements would be least likely to form compounds with color?Why?
5.How are differences in properties among the transition elements explained?
6.How can a transition metal form an ion with a charge of 3+ or higher?
7.Identify three ways transition metals are separated from their ores.
8.Explain how a metal can become a temporary magnet.
9.Explain why some metals can act as permanent magnets.
For each item in Column A,write the letter of the matching item in Column B.The
items in Column B can be used more than once.
Column A 10.Found in the center of a hemoglo

答案

1.What is the difference between the transition metals and the inner transition metals?
For transition metals,the highest valence subshell is d subshell
For inner transition metals the highest valence subshell is f subshell.
2.Write the electron configAurations for titanium (Ti),vanadium (V),chromium (Cr),and manganese (Mn).
Ti:4s23d2; V:4s23d3; Cr:4s13d5; Mn:4s23d5
3.Which of the elements listed in question 2 would be the hardest?Cr!
Which would have the highest melting and boiling points?V
Why?
4.Which of the elements would be least likely to form compounds with color?Ti,
Why?easy to give out all of its d electrons
5.How are differences in properties among the transition elements explained?Ti,V are early transition metals,likely for form d0 compounds,while Mn is middle-late transition metal,likely to form d5 (Mn2+) compound,and Cr in between.
6.How can a transition metal form an ion with a charge of 3+ or higher?because it could lose 3 or more of its d electrons.
7.Identify three ways transition metals are separated from their ores.Acid Extraction,Molten salt reduction,Molten Electrolysis
8.Explain how a metal can become a temporary magnet.
For some of them,at the different temperature some previous paired electrons becomes unpaired
9.Explain why some metals can act as permanent magnets.
Some always contain unpaired electrons.
For each item in Column A,write the letter of the matching item in Column B.The
items in Column B can be used more than once.
Column A 10.Found in the center of a hemoglobin molecule
11.Provides a protective coating to resist rusting Zn
12.Used in electrical wiring Cu,Ag,Pt
13.Needed for the development of red blood cells Fe
14.Can control the conditions at which a reaction occurs
15.Involved in cell respiration Mg
16.The main element in steel Fe
17.Are classified as “strategic” metals Ti,Cr,Mn
18.Found in molecules that help the body digest proteins
and eliminate carbon dioxide Cu
19.The best conductor of electricity Ag