The diagrams below illustrate models of various chemical compounds. the diagrams suggest that compounds must be a. made up of oxygen and one other chemical element. b. made up of two or more of the same chemical elements only. c. made up of only one chemical element. d. made up of two or more different chemical elements.

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

In 2002, the rare earth elements mine in mountain pass, california was closed because

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent