GitHub

For a given chemical formula represented by a string, count the number of atoms of each element contained in the molecule and return an object.

var water = 'H2O'; parseMolecule(water); // return {H: 2, O: 1} var magnesiumHydroxide = 'Mg(OH)2'; parseMolecule(magnesiumHydroxide); // return {Mg: 1, O: 2, H: 2 ...
GitHub

balancing chemical equations.py

The following is a program that balances an inputted chemical equation by utilizing a function that counts the number of "atoms" in a string by identifying their elemental symbol through the use of ...
Nature

Counting atoms

The need for a physical constant quantifying a reference amount of substance is a manifestation of the atomic nature of matter. At the basis of the concept of a 'quantity constant' lies the law of ...
The Conversation

From microchips to moon rocks: how the world depends on counting atoms

Chris Jeynes works for the University of Surrey Ion Beam Centre which receives funding from the Engineering and Physical Sciences Research Council and others for ion implantation and ion beam analysis ...
BBC

Empirical formula and molecular formula

You can work out the molecular formula from the empirical formula, if you know the relative mass formula (M r) of the compound. Add up the atomic masses of the atoms in the empirical formula. The ...
MIT Technology Review

Physicists Count The Number of Atoms In 1kg of Silicon

How many atoms are there in a kilogram of silicon? This number is Avogadro’s constant and working out its value is one of the more important tasks that materials scientists face. Today, a group of ...