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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.

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

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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.