====== Periodic Table of Elements ======

back to [[Chemistry]]

The basic building block of matter is the **atom**.

There are 118 types of atoms.  Each of these types is called an **element**.

The elements are organized into a table of 7 rows and 18 columns.  Each row is considered a period, and therefore we call this table the **Periodic Table** of the elements.

{{https://www.wuwm.com/sites/wuwm/files/201912/AdobeStock_238869971.jpg}}

An interactive version of the Periodic Table
https://www.ptable.com/

A spreadsheet listing of all the elements
https://docs.google.com/spreadsheets/d/1-i-CU-5BUZndE6IFHtZ-gagMftD691Z9e0o-GWmp0iI/edit?usp=drivesdk

{{https://youtu.be/TDFAYRtrYuk | YouTube: Breaking Bad credits}}

PubChem - a searchable database of all elements, molecules, chemical formulas, etc.
[[https://pubchem.ncbi.nlm.nih.gov/]]

Form at room temperature.
  * Solid
  * Liquid
  * Gas
  * Unknown

Groups of elements
  * Metals
      * Alkali metals
      * Alkaline earth metals
      * Lanthanoids
      * Actinoids
      * Transition metals
      * Post-transition metals
    * Metalloids
    * Nonmetals
      * Reactive nonmetals
      * Noble Gases

Identifiers for each element
  * atomic number - the number of protons in one atom of this element
  * symbol - a one or two-letter abbreviation of the name
  * name - the name of the element
  * atomic weight - the average weight of an atom of this element

table structure
  * 7 rows
  * 18 columns

Example: Hydrogen
  * Position: row 1, column 1
  * Atomic number: 1.  That means the atom has one proton.
  * symbol: H
  * name: Hydrogen
  * weight: 1.008


Atoms are made of **protons**, **neutrons**, and **electrons**.