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2. CPK coloring - Wikipedia

   en.wikipedia.org/wiki/CPK_coloring

   Several of the CPK colors refer mnemonically to colors of the pure elements or notable compound. For example, hydrogen is a colorless gas, carbon as charcoal, graphite or coke is black, sulfur powder is yellow, chlorine is a greenish gas, bromine is a dark red liquid, iodine in ether is violet, amorphous phosphorus is red, rust is dark orange-red, etc.

3. SpaceChem - Wikipedia

   en.wikipedia.org/wiki/SpaceChem

   SpaceChem was the developer's first foray into a commercial title after a number of free Flash-based browser games that feature similar puzzle-based assembly problems. The game was initially released for Microsoft Windows at the start of 2011 via Zachtronics' own website.

4. Atomix (video game) - Wikipedia

   en.wikipedia.org/wiki/Atomix_(video_game)

   Atomix is a puzzle video game developed by Günter Krämer (as "Softtouch") and published by Thalion Software, released for the Amiga and other personal computers in late 1990. The object of the game is to assemble molecules from compound atoms by moving the atoms on a two-dimensional playfield.

5. Electron counting - Wikipedia

   en.wikipedia.org/wiki/Electron_counting

   Neutral counting assumes each bond is equally split between two atoms. This method begins with locating the central atom on the periodic table and determining the number of its valence electrons. One counts valence electrons for main group elements differently from transition metals, which use d electron count .

6. Grundy number - Wikipedia

   en.wikipedia.org/wiki/Grundy_number

   A Grundy coloring of a t-atom can be obtained by coloring the independent set first with the smallest-numbered color, and then coloring the remaining (t − 1)-atom with an additional t − 1 colors. For instance, the only 1-atom is a single vertex, and the only 2-atom is a single edge, but there are two possible 3-atoms: a triangle and a four ...

7. Black Box (game) - Wikipedia

   en.wikipedia.org/wiki/Black_Box_(game)

   Black Box is an abstract board game for one or two players, which simulates shooting rays into a black box to deduce the locations of "atoms" hidden inside. It was created by Eric Solomon. The board game was published by Waddingtons from the mid-1970s and by Parker Brothers in the late 1970s.

8. Coordination number - Wikipedia

   en.wikipedia.org/wiki/Coordination_number

   In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. This number is determined somewhat differently for molecules ...

9. Atom (measure theory) - Wikipedia

   en.wikipedia.org/wiki/Atom_(measure_theory)

   This space is atomic, with all atoms being the singletons, yet the space is not able to be partitioned into the disjoint union of countably many disjoint atoms, = and a null set since the countable union of singletons is a countable set, and the uncountability of the real numbers shows that the complement = = would have to be uncountable, hence ...