If a compound forms by ionic bonding, which is not true?
a. the net charge of the compound is zero.
b. several ions group together in a tightly packed structure.
c. a positively charged atom or group of atoms attracts a negatively charged atom or group of atoms.
d. the compound contains just two atoms, each of opposite charge.
the only property listed that is not characteristic of ionic compounds is
a. hardness.
b. lack of crystal structure.
c. brittleness.
d. high melting point.

(C)

Explanation:

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.