Which of the following correctly describes a compound? (4 points) Group of answer choices The atoms are not chemically bonded, and there is no set ratio for how the atoms can combine together. The atoms can only combine in fixed ratios, and they can only be separated by a chemical change. The atoms do not retain their individual chemical properties, and they can be separated by physical means. The atoms are chemically bonded together, and they retain their individual physical and chemical properties.

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.