As you move down through the family of alkali metals, the first ionization energy because A) increases; the atomic radii increase.

B) increases; the atomic radii decrease.

C) decreases; the atomic radii increase.

D) remains constant; all the elements lose one electron.

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.

What happens to isotopes that are unstable?

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures