The inertness of the noble gases is due to
a. the outermost shell has six electrons.
b. the bonds they form with other elements.
c. the number of protons and neutrons.
d. the outermost shell has an octet of electrons, except for helium which has two electrons.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong