Atoms of the least reactive elements tend to have
a. one or seven valence electrons.
b. eight valence electrons.
c. four or five valence electrons. d. no valence electrons

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

An asteroid is discovered in a nearly circular orbit around the sun, with an orbital radius that is 2.47 times earth's. what is the asteroid's orbital period, its "year," in terms of earth years?

There are weak or strong attractive forces between atoms of liquids with a high viscosity