In addition to those of Groups 1A and 2A, three common elements that form only one ion each are
a. Sc, Ti, and Hg.
b. Pb, Sn, and Cu.
c. Al, Zn, and Ag.
d. Ga, Ni, and Fe.
c
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The electrical resistivity of tantalum (Ta) at temperatures approaching 0 K is 1×10-8 ?·m, and at 150K it is 7×10-8 ?·m. Analytically predict the electrical resistivity of Ta at 295 K.
What will be an ideal response?
Uniform Circular Motion: The Moon is 3.84 × 108 m from Earth and takes 27.3 days to complete each orbit. What are the magnitude and direction of the acceleration of the Moon, assuming a circular orbit?
What will be an ideal response?
Give at least one example of each of the following:
(a) longitudinal standing wave. (b) transverse standing wave.
If the population of a country doubles every 25 years, a 1980 population of 10 million will reach 80 million in the year
a. 2005. b. 2030. c. 2055. d. 2080. e. 2105.