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  2. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    Atoms can attach to one or more other atoms by chemical bonds to form chemical compounds such as molecules or crystals. The ability of atoms to attach and detach from each other is responsible for most of the physical changes observed in nature. Chemistry is the science that studies these changes.

  3. Molecular self-assembly - Wikipedia

    en.wikipedia.org/wiki/Molecular_self-assembly

    Molecular self-assembly is a key concept in supramolecular chemistry. [6] [7] [8] This is because assembly of molecules in such systems is directed through non-covalent interactions (e.g., hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, pi-stacking interactions, and/or electrostatic) as well as electromagnetic interactions.

  4. Ball-and-stick model - Wikipedia

    en.wikipedia.org/wiki/Ball-and-stick_model

    In chemistry, the ball-and-stick model is a molecular model of a chemical substance which displays both the three-dimensional position of the atoms and the bonds between them. [1] The atoms are typically represented by spheres , connected by rods which represent the bonds.

  5. Self-assembly - Wikipedia

    en.wikipedia.org/wiki/Self-assembly

    SDS is a surfactant with a hydrocarbon tail (yellow) and a SO 4 head (blue and red), while cyclodextrin is a saccharide ring (green C and red O atoms). Transmission electron microscopy image of an iron oxide nanoparticle. Regularly arranged dots within the dashed border are columns of Fe atoms. Left inset is the corresponding electron ...

  6. Aufbau principle - Wikipedia

    en.wikipedia.org/wiki/Aufbau_principle

    In atomic physics and quantum chemistry, the Aufbau principle (/ ˈ aʊ f b aʊ /, from German: Aufbauprinzip, lit. 'building-up principle'), also called the Aufbau rule, states that in the ground state of an atom or ion, electrons first fill subshells of the lowest available energy, then fill subshells of higher energy. For example, the 1s ...

  7. NFL playoff scenarios: Which teams can clinch in Week 15? - AOL

    www.aol.com/nfl-playoff-scenarios-teams-clinch...

    With four weeks left in the NFL regular season, only four teams have clinched playoff spots. But several more could join them in Week 15.

  8. Lewis structure - Wikipedia

    en.wikipedia.org/wiki/Lewis_structure

    A simpler method has been proposed for constructing Lewis structures, eliminating the need for electron counting: the atoms are drawn showing the valence electrons; bonds are then formed by pairing up valence electrons of the atoms involved in the bond-making process, and anions and cations are formed by adding or removing electrons to/from the ...

  9. 2024 NFL playoff picture: Who’s sealed their spot and who’s ...

    www.aol.com/sports/2024-nfl-playoff-picture...

    The NFL playoffs are nearly in sight and the heat is on for some teams still in the fight to make the postseason.. Week 15 saw the number of teams that have qualified for the playoffs increase to ...