The removal of an electron from an atom is called
a. binding affinity.
b. atomizing.
c. electron affinity.
d. ionization.
d
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Which of the following is true of O and B associations?
A) Their parallax can be easily measured. B) They are bad spiral tracers. C) Their distance is usually found by spectroscopic parallax. D) They reveal parts of six spiral arms near the Sun.
What becomes of the heavy elements produced by fusion in low-mass stars?
A. When the star goes supernova, they are sucked into the neutron star or black hole. B. They are blasted outward in a violent explosion. C. At the end of the star's life, they are dredged up by convection and pushed outward by photons. D. They are forever trapped in the core of the star. E. Low-mass stars do not produce heavy elements.
The supercontinent of Pangaea formed during the
A) Cenozoic. B) Paleozoic. C) Mesozoic. D) Precambrian.
If the relative humidity is 50%, what happens when the temperature drops and the mass of water in the air stays the same?
A) Relative humidity drops. B) Relative humidity rises. C) Relative humidity stays the same. D) Outcome depends on the temperature of the air.