vice.stable_isotopes
====================

The VICE dataframe: stable isotopes

The mass number (protons and neutrons) of the stable isotopes of each
element. Stored values are of type ``list``, elements of which are of type
``int``.

.. versionadded:: 1.1.0

Indexing
--------
- ``str`` [case-insensitive]
	The symbol of a chemical element as it appears on the periodic table.

Item Assignment
---------------
This instance of the VICE dataframe does not support item assignment.

Functions
---------
- keys
- todict

Example Code
------------
>>> import vice
>>> vice.stable_isotopes['he']
[3, 4]
>>> vice.stable_isotopes['o']
[16, 17, 18]
>>> vice.stable_isotopes['fe']
[54, 56, 57, 58]