OpenPeriodic

Open-sourced machine-readable periodic table data.

Specification

In its simplest form, OpenPeriodic is a compiliation of YAML files representing all of the elements of the periodic table. On each release, the YAML files will be compiled into one single YAML file containing all of the elements.

Element Files

Each element file will be titled as follows: [number]_[element].yml

• [number]: The atomic number of the element.
• [element]: The element name.

Properties

Key	Type	Description
Basics
symbol	String	The chemical symbol for the element. (e.g. H, He, Ar)
name	String	The chemical name. (e.g. Hydrogen, Helium, Argon)
number	Integer	The atomic number of the element.
weight	Float	The average atomic mass (or atomic weight) of the element.
Classification
group	Integer	The group (column) that the element is in. Leave out for lanthanoids and actinoids.
period	Integer	The period that the element is in. Also the number of energy levels at ground state.
family	Family	The family that the element is part of.

Enumerations

Family

The family of the element. The acceptable values are listed below.

Value	Description
alkali	Alkali Metals (i.e. Metals in group 1)
alkalineEarth	Alkaline Earth Metals (i.e. Metals in group 2)
transition	Metals in the d-block, excluding group 12.
postTransition	Metals in the p-block, plus group 12.
lanthanoid	Lanthanoids (elements 57-71)
actinoid	Actinoids (elements 89-103)
metalloid	Metalloids
reactive	Reactive Nonmetals
halogen	Halogens (group 17)
nobleGas	Noble Gases (group 18)
unknown	Unclassified Elements