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A C++ library implementing basic chemical constructs such as elements, substances, reactions.

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Atomik

Note: This library is no longer developed nor maintained. Use Reaktoro instead (https://reaktoro.org).

Atomik is a C++17 library that implements classes such as Element, Elements, Substance, Substances, Formula, and others to be used in libraries of the Reaktoro Project.

Overview

Below we present a few use cases in which Atomik library can be helpful.

Using class Formula to parse chemical formulas

Given chemical formulas such as H2O, CO2, CaCO3, (CaMg)(CO3)2, Atomik can help you parsing them into lists of element symbols and coefficients. See example below:

// C++ includes
#include <iostream>
using namespace std;

// Atomik includes
#include <Atomik/Atomik.hpp>
using namespace Atomik;

int main()
{
    Formula formula("CaCO3");

    cout << "The elemental composition of CaCO3 is:" << endl;
    for(auto symbol : formula.symbols())
        cout << symbol << ": " << formula.coefficient(symbol) << endl;
}

Note: Formula can parse any chemical formula and the elements might not even exist, such as AaBb2. The requirements are that the element symbols in your formula:

  • start with an uppercase letter and continue with lowercase letters only (e.g., A, Bb, Ccx are valid names, but not AaB!);
  • has no digits (i.e., Aa2 not allowed - I guess you know why!); and
  • when needed, parenthesis need to be consistent (e.g., Ca(CO3) and (Ca)((CO3)) are both valid formulas, but not Ca)(CO3!).

Using class Substance to obtain certain properties from their chemical formulas

A Formula object only has element symbols, which are strings such as "H", "O", "Ca", and so forth. A Substance object, on the other hand, will use a given chemical formula to create Element objects from a default Elements object (a collection of Element objects initialized based on 120 elements of the ) be incontain We can also create Substance objects from given chemical formulas and compute their molar masses, determine their electric charges, the elements that compose it, and so forth:

Substance substance("CO3--"); // or CO3-2 if you prefer!

cout << "The molar mass of CaCO3 is (in kg/mol)" << endl;
cout << substance.molarMass() << endl;

cout << "The electric charge of CO3-- is" << endl;
cout << substance.charge() << endl;

The above example of constructing a Substance object is identical to:

Elements elementdb = Elements::PeriodicTable();
Substance substance("CO3--", elementdb);

The static member method Elements::PeriodicTable() returns an Elements objects initialized with Element instances as show here. If you want to use customized elements (for example, Aa and Bb), then you can do:

Elements elementdb;

Element elementAa({
    .symbol = "Aa",
    .name = "Aa",
    .atomicNumber = 0,
    .atomicWeight = 123.4,
    .electronegativity = 0.123,
    .tags = {"my-strange-element" }
});

Element elementBb({
    .symbol = "Bb",
    .name = "Bb",
    .atomicNumber = 0,
    .atomicWeight = 321.0,
    .electronegativity = 0.321,
    .tags = {"my-strange-element" }
});

elementdb.append(elementAa);
elementdb.append(elementBb);

Substance substance("AaBb2", elementdb);

Using Substances objects

The Substances class is a convenient class to manage a collection of Substance objects and create other substance collections by using its rich selection of filter methods as shown below:

// Initialize a Substances object from some database of substances
Substances substances = /* initialize from some database */;

// Filter all substances with tag "aqueous" and composed by some given elements
Substances aqueous = substances.tagged("aqueous").containing("H C O Na Cl Z");  // Z below is the name of the electric charge element!

// Filter all substances with given unique names
Substances gaseous = substances.withNames("H2O(g) CO2(g) CH4(g)");

Installation

Installation of Atomik using CMake is greatly simplified if conda is available in your system. We recommend you to install a Python 3.x (64-bit) installer of Miniconda to give you access to the conda application.

Once you have installed conda, append the conda-forge channel so that we can have access to a rich collection of packages in addition to the default channel:

conda config --append channels conda-forge

The next step is to install conda-devenv to create a conda development environment containing all required library dependencies of Atomik.

conda install conda-devenv

After this, you should execute:

conda activate atomik

to activate the create conda environment.

It's now time to download Atomik from GitHub:

git clone https://github.com/reaktoro/atomik.git

and then start the build & install task by executing:

cmake -P install

This will install Atomik header, library, and cmake configuration files in your created conda environment, and not in your system. If you wish to install Atomik in a different location, use:

cmake -DPREFIX=/home/user/other -P install

License

Copyright (C) 2018-2019 Allan Leal and Reaktoro Contributors

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library. If not, see http://www.gnu.org/licenses/.

Contact us

Do you have a question or want to report a bug or any other issue? Please create a GitHub Issue and let us know.

Appendix

Elements from Elements::PeriodicTable()

The table below shows the attributes of the elements that are used in the static member method Elements::PeriodicTable().

Note: The only difference from the standard periodic table is the addition of element Z, which denotes an element representative of electric charges. This has been added for convenience reasons, to allow, for example, Formula to determine the charge of chemical formulas such as HCO3- or Fe+3 (alternatively Fe+++).

Symbol Name Atomic Number Atomic Weight (kg/mol) Electronegativity
Z Charge 0 0.000000000 0.00
H Hydrogen 1 0.001007940 2.20
He Helium 2 0.004002602 0.00
Li Lithium 3 0.006941000 0.98
Be Beryllium 4 0.009012180 1.57
B Boron 5 0.010811000 2.04
C Carbon 6 0.012011000 2.55
N Nitrogen 7 0.014006740 3.04
O Oxygen 8 0.015999400 3.44
F Fluorine 9 0.018998403 3.98
Ne Neon 10 0.020179700 0.00
Na Sodium 11 0.022989768 0.93
Mg Magnesium 12 0.024305000 1.31
Al Aluminum 13 0.026981539 1.61
Si Silicon 14 0.028085500 1.90
P Phosphorus 15 0.030973762 2.19
S Sulfur 16 0.032066000 2.58
Cl Chlorine 17 0.035452700 3.16
Ar Argon 18 0.039948000 0.00
K Potassium 19 0.039098300 0.82
Ca Calcium 20 0.040078000 1.00
Sc Scandium 21 0.044955910 1.36
Ti Titanium 22 0.047880000 1.54
V Vanadium 23 0.050941500 1.63
Cr Chromium 24 0.051996100 1.66
Mn Manganese 25 0.054938050 1.55
Fe Iron 26 0.055847000 1.83
Co Cobalt 27 0.058933200 1.88
Ni Nickel 28 0.058693400 1.91
Cu Copper 29 0.063546000 1.90
Zn Zinc 30 0.065390000 1.65
Ga Gallium 31 0.069723000 1.81
Ge Germanium 32 0.072610000 2.01
As Arsenic 33 0.074921590 2.18
Se Selenium 34 0.078960000 2.55
Br Bromine 35 0.079904000 2.96
Kr Krypton 36 0.083800000 0.00
Rb Rubidium 37 0.085467800 0.82
Sr Strontium 38 0.087620000 0.95
Y Yttrium 39 0.088905850 1.22
Zr Zirconium 40 0.091224000 1.33
Nb Niobium 41 0.092906380 1.60
Mo Molybdenum 42 0.095940000 2.16
Tc Technetium 43 0.097907200 1.90
Ru Ruthenium 44 0.101070000 2.20
Rh Rhodium 45 0.102905500 2.28
Pd Palladium 46 0.106420000 2.20
Ag Silver 47 0.107868200 1.93
Cd Cadmium 48 0.112411000 1.69
In Indium 49 0.114818000 1.78
Sn Tin 50 0.118710000 1.96
Sb Antimony 51 0.121760000 2.05
Te Tellurium 52 0.127600000 2.10
I Iodine 53 0.126904470 2.66
Xe Xenon 54 0.131290000 0.00
Cs Cesium 55 0.132905430 0.79
Ba Barium 56 0.137327000 0.89
La Lanthanum 57 0.138905500 1.10
Ce Cerium 58 0.140115000 1.12
Pr Praseodymium 59 0.140907650 1.13
Nd Neodymium 60 0.144240000 1.14
Pm Promethium 61 0.144912700 0.00
Sm Samarium 62 0.150360000 1.17
Eu Europium 63 0.151965000 0.00
Gd Gadolinium 64 0.157250000 1.20
Tb Terbium 65 0.158925340 1.20
Dy Dysprosium 66 0.162500000 0.00
Ho Holmium 67 0.164930320 1.23
Er Erbium 68 0.167260000 1.24
Tm Thulium 69 0.168934210 1.25
Yb Ytterbium 70 0.173040000 1.10
Lu Lutetium 71 0.174967000 1.27
Hf Hafnium 72 0.178490000 1.30
Ta Tantalum 73 0.180947900 1.50
W Tungsten 74 0.183840000 1.70
Re Rhenium 75 0.186207000 1.90
Os Osmium 76 0.190230000 2.20
Ir Iridium 77 0.192220000 2.20
Pt Platinum 78 0.195080000 2.28
Au Gold 79 0.196966540 2.54
Hg Mercury 80 0.200590000 2.00
Tl Thallium 81 0.204383300 1.62
Pb Lead 82 0.207200000 1.80
Bi Bismuth 83 0.208980370 2.02
Po Polonium 84 0.208982400 2.00
At Astatine 85 0.209987100 2.20
Rn Radon 86 0.222017600 0.00
Fr Francium 87 0.223019700 0.70
Ra Radium 88 0.226025400 0.90
Ac Actinium 89 0.227027800 1.10
Th Thorium 90 0.232038100 1.30
Pa Protactinium 91 0.231035880 1.50
U Uranium 92 0.238028900 1.38
Np Neptunium 93 0.237048000 1.36
Pu Plutonium 94 0.244064200 1.28
Am Americium 95 0.243061400 1.30
Cm Curium 96 0.247070300 1.30
Bk Berkelium 97 0.247070300 1.30
Cf Californium 98 0.251079600 1.30
Es Einsteinium 99 0.252083000 1.30
Fm Fermium 100 0.257095100 1.30
Md Mendelevium 101 0.258100000 1.30
No Nobelium 102 0.259100900 1.30
Lr Lawrencium 103 0.262110000 0.00
Rf Rutherfordium 104 0.261000000 0.00
Db Dubnium 105 0.262000000 0.00
Sg Seaborgium 106 0.266000000 0.00
Bh Bohrium 107 0.264000000 0.00
Hs Hassium 108 0.269000000 0.00
Mt Meitnerium 109 0.268000000 0.00
Ds Darmstadtium 110 0.269000000 0.00
Rg Roentgenium 111 0.272000000 0.00
Cn Copernicium 112 0.277000000 0.00
Nh Nihonium 113 0.000000000 0.00
Fl Flerovium 114 0.289000000 0.00
Mc Moscovium 115 0.000000000 0.00
Lv Livermorium 116 0.000000000 0.00
Ts Tennessine 117 0.000000000 0.00
Og Oganesson 118 0.000000000 0.00

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