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  2. VSEPR theory - Wikipedia

    en.wikipedia.org/wiki/VSEPR_theory

    The electron pairs around a central atom are represented by a formula AX m E n, where A represents the central atom and always has an implied subscript one. Each X represents a ligand (an atom bonded to A). Each E represents a lone pair of electrons on the central atom. [1]: 410–417 The total number of X and E is known as

  3. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...

  4. Valence bond theory - Wikipedia

    en.wikipedia.org/wiki/Valence_bond_theory

    Modern valence bond theory replaces the overlapping atomic orbitals by overlapping valence bond orbitals that are expanded over a large number of basis functions, either centered each on one atom to give a classical valence bond picture, or centered on all atoms in the molecule.

  5. Lone pair - Wikipedia

    en.wikipedia.org/wiki/Lone_pair

    Thus, the number of electrons in lone pairs plus the number of electrons in bonds equals the number of valence electrons around an atom. Lone pair is a concept used in valence shell electron pair repulsion theory (VSEPR theory) which explains the shapes of molecules. They are also referred to in the chemistry of Lewis acids and bases. However ...

  6. Trigonal pyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Trigonal_pyramidal...

    In chemistry, a trigonal pyramid is a molecular geometry with one atom at the apex and three atoms at the corners of a trigonal base, resembling a tetrahedron (not to be confused with the tetrahedral geometry).

  7. Government shutdown odds are rising. Economic experts aren’t ...

    www.aol.com/finance/government-shutdown-odds...

    Other stoppages have been much shorter, with economic analyses after the fact often showing that the lost money is then returned to the US economy in nearly equal measure after the government reopens.

  8. You Need to Check the Label of Your Parmesan Cheese ASAP - AOL

    www.aol.com/check-label-parmesan-cheese-asap...

    How can I find the real stuff at the grocery store? Luckily it’s fairly easy to spot Parmigiano Reggiano IRL — if you know where to look: Check the label: First, make sure the product is ...

  9. Demi Moore admits she thought “Ghost” might be a 'f---ing ...

    www.aol.com/demi-moore-admits-she-thought...

    "It had so many different genres mixed together that, truly, I thought, 'This could either be amazing or a f---ing disaster,'" Moore said of Ghost. "Either way, it's usually the kind of juice that ...

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