chemelem

Chemical elements with atomic masses and radii

This package implements getting atomic masses or covalent radii by element or atomic number. It is intended to be simple and load fast.

Usage

The package provides dict-like objects: mass, covalent_radius, and chemelem, which can be indexed by atomic number (int, from 1 to 118) or element symbol (str such as 'Cl').

• Getting the atomic mass (standard, isotope-weighted atomic weight) in amu:

  import chemelem as ce
  ce.mass['Cl']
  ce.mass[17]
  

  Both give the same result: 35.47

• Getting the covalent radius (value in pm):

  import chemelem as ce
  ce.covalent_radius['Fe']
  ce.covalent_radius[26]
  

  Both give the same result: 116.0.

• Getting all the element's properties as dictionary:

  import chemelem as ce
  ce.chemelem['Cl']
  ce.chemelem[17]
  

  Both give the same result: {'atomic_number': 17, 'symbol': 'Cl', 'mass': 35.45, 'covalent_radius': 99.0}.

• The elements properties can be also obtained using the chemelem console script

  chemelem Cl