sos,明天要交作业了

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 hemoglobin molecule
11.Provides a protective coating to resist rusting
12.Used in electrical wiring
13.Needed for the development of red blood cells
14.Can control the conditions at which a reaction occurs
15.Involved in cell respiration
16.The main element in steel
17.Are classified as “strategic” metals
18.Found in molecules that help the body digest proteins
and eliminate carbon dioxide
19.The best conductor of electricity
Column B
a.tungsten
b.chromium
c.zinc
d.cobalt
e.iron
f.platinum
g.manganese
h.copper
i.silver
In your textbook,read about the inner transition metals.
Write the word or words that best complete the statement.
20.Because there is little difference in the properties of the ,they
are usually found mixed together in nature.
21.Welders’goggles contain and because
these elements absorb high energy radiation.
22.Because some of its compounds emit red light when excited by electrons,
is often used in TV screens.
23.The are radioactive.
24.Elements with atomic numbers above 92 are called .
25.Some smoke detectors used in the home contain