Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because
A. helium is most similar to other group 18 elements.
B. hydrogen and helium repel one another.
C. the sizes of their atoms are vastly different.
D. they come from different sources.
Answer: A
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A) a general, graphic indication of the growth rate B) males in the population C) females in the population D) age distribution of the population E) birth and death rates
Which of the following gives the correct order of solubility in water?
A) C2H5NH2 < C4H9NH2 < C6H13NH2 B) C2H5NH2 < C6H13NH2 < C4H9NH2 C) C6H13NH2 < C4H9NH2 < C2H5NH2 D) C6H13NH2 < C2H5NH2 < C4H9NH2
The branch of soil science that studies soil as a medium for sustaining the growth of higher plants is known as
A) pedology. B) geology. C) edaphology. D) geomorphology.
The primary control of glacial-interglacial episodes seems to be variations in the Earth's orbit and inclination to the sun.
Answer the following statement true (T) or false (F)