Chem 231 Midterm Quiz with Complete Solutions

Chem 231 Midterm Quiz with Complete Solutions What is the Pauli Exclusion Principal? ANSWER no two electrons in an atom can have the same four quantum numbers What is Hund's rule? ANSWER every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied State and explain the trend in atomic size horizontally and vertically on the periodic table ANSWER atoms get smaller from left to right because the protons pull the electrons closer, while the atomic size gets BIGGER when moving down a group because of the addition of energy levels State and explain the trend in ionic radii ANSWER ionic radii decreases from left to right due to an increase in nuclear charge, while ionic radii INCREASES from top to bottom due to electrons being added to higher energy levels define the term "isoelectronic" and give examples ANSWER when two atoms, ions, or molecules have the same number of electrons. They also have an identical electron configuration, such as Neon and Sodium, and Chloring and Argon. State and explain the trends in ionization energies on the periodic table ANSWER ionization energy increases across a period, and decreases down a group explain why some of the first ionization energies do not follow this trend ANSWER anomalies occur when there is a half-filled or fully filled subshell because they are more stable, and removing an electron requires more energy define first ionization energy ANSWER the energy required to remove the first electron from