Chemistry 1301A/B Lecture Notes - Lecture 10: Atomic Number, Periodic Trends, Periodic Table

• School: Western University
• Department: Chemistry
• Course: Chemistry 1301A/B
• Professor: Felix Lee

Document Summary

The periodic table contains all of the unique types of elements in the universe, including some human synthesized ones, all organized by increasing atomic number. It is these valence electrons that determine all chemical properties. Also, keep in mind that the periodic table is primarily used a tool to predict the chemical and physical properties of elements, and that in all cases, these properties arise from the atomic structure of the elements. The zig-zag separates metals (on the left) from non-metals (on the right) Group number- indicates the number of valence electrons. Period number- indicates the number of energy levels. The atomic number (z) defines the element and indicates the number of protons (p+). This number can also generally be used to determine the number of electrons (e-) as an element should be electrically neutral. Notice that all atomic symbols are one capital letter or one capital letter and one lowercase letter.