Hydrogen is generally classified as a
a. semimetal.
b. nonmetal.
c. metal.
d. noble gas.
b
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Exclusion Principle: Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A. 11 B. 17 C. 18 D. 19 E. 36
What factor is not in the Drake Equation?
A: Fraction of stars with planets B: Number of habitable planets per star with planets C: Communication lag due to large distances between stars D: Fraction of life-bearing planets on which intelligence involves E: Average lifetime of a technologically competent civilization
Maxwell developed his theory of electromagnetism by combining previous discoveries. He added his own original hypothesis that:
a. electric charges produce electric fields. b. moving electric charges produce magnetic fields. c. changing electric fields produce magnetic fields. d. changing magnetic fields produce electric fields.
If a spherical galaxy of diameter 100,000 ly contained enough mass to be a black hole, what would be its mass?
A) 200 x 109 kg B) 400 x 109 kg C) 6.9 x 1023 kg D) 3.2 x 1047 kg E) 6.4 x 1047 kg