Different atoms in the same column of the periodic table of elements
A. have equal masses.
B. have identical chemical properties.
C. have a simple ratio of masses.
D. have similar chemical properties.
Answer: D
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The actual matter density of the universe, accounting for all of the luminous matter and all of the dark matter known to exist in galaxies and clusters, is what fraction of the critical density?
A) 25 percent B) 10 percent C) 200 percent D) 1 percent E) 100 percent
Hydrogen is the most abundant element in Jupiter's atmosphere.
Answer the following statement true (T) or false (F)
Which star has the largest proper motion? Why?
What will be an ideal response?
An object is dropped and freely falls to the ground with acceleration g. If it is thrown upward at an angle instead, neglecting air drag, the acceleration along its path will be
A) less than g. B) the same. C) more than g.