The correct ground state electron configuration of boron, which has 5 electrons, is
A) 1s22s22p.
B) 1s22s22p3.
C) 1s21p22s.
D) 1s22p23s.
E) 1s22p3.
Answer: A
Physics & Space Science
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A simply supported beam is loaded as shown in the figure. The bending moment at point C is approximately:
(A) 5.7 kN?m
(B) 6.1 kN?m
(C) 6.8 kN?m
(D) 9.7 kN?m
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Electrons that are energized to glow in the filament of a common ac lamp are
A) supplied by a wall outlet. B) supplied by a wall outlet, which in turn are supplied by your power company. C) electrons already in the filament. D) none of the above
Physics & Space Science
When bullets are fired in a forward direction from a fighter aircraft, the momentum of the aircraft
A) decreases. B) is unchanged. C) increases.
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The Eocene is a(n)
a. epoch. b. era. c. eon. d. period.
Physics & Space Science