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  2. Number bond - Wikipedia

    en.wikipedia.org/wiki/Number_bond

    For example, a number bond looks like + = A child who "knows" this number bond should be able to immediately fill in any one of these three numbers if it were missing, given the other two, without having to "work it out". Number bonds are often learned in sets for which the sum is a common round number such as 10 or 20. Having acquired some ...

  3. Duration (finance) - Wikipedia

    en.wikipedia.org/wiki/Duration_(finance)

    1. Estimate the bond value The coupons will be $50 in years 1, 2, 3 and 4. Then, on year 5, the bond will pay coupon and principal, for a total of $1050. Discounting to present value at 6.5%, the bond value is $937.66. The detail is the following: Year 1: $50 / (1 + 6.5%) ^ 1 = 46.95 Year 2: $50 / (1 + 6.5%) ^ 2 = 44.08

  4. Structural formula - Wikipedia

    en.wikipedia.org/wiki/Structural_formula

    CH 3 CH 2 OH . Parentheses are used to indicate multiple identical groups, indicating attachment to the nearest non-hydrogen atom on the left when appearing within a formula, or to the atom on the right when appearing at the start of a formula: (CH 3) 2 CHOH or CH(CH 3) 2 OH . In all cases, all atoms are shown, including hydrogen atoms.

  5. Weighted-average life - Wikipedia

    en.wikipedia.org/wiki/Weighted-Average_Life

    WAL should not be confused with the following distinct concepts: Bond duration Bond duration is the weighted-average time to receive the discounted present values of all the cash flows (including both principal and interest), while WAL is the weighted-average time to receive simply the principal payments (not including interest, and not discounting).

  6. Wikipedia : Manual of Style/Chemistry/Structure drawing

    en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/...

    The configuration is extremely limited and post-processing is likely required. The only useful thing in "Format → Drawing settings..." is "Double bond spacing", which should be set to 18% of bond length, i.e. 5 pixels (integers only!) for the default 25-pixel bonds. Actual pixel sizes don't matter considering we will be doing an SVG report.

  7. Lewis structure - Wikipedia

    en.wikipedia.org/wiki/Lewis_structure

    [1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [4] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.

  8. Bond length - Wikipedia

    en.wikipedia.org/wiki/Bond_length

    Current record holder for the longest C-C bond with a length of 180.6 pm is 1,8-Bis(5-hydroxydibenzo[a,d]cycloheptatrien-5-yl)naphthalene, [2] one of many molecules within a category of hexaaryl ethanes, which are derivatives based on hexaphenylethane skeleton. Bond is located between carbons C1 and C2 as depicted in a picture below.

  9. Valence bond theory - Wikipedia

    en.wikipedia.org/wiki/Valence_bond_theory

    Since the nature of the overlapping orbitals are different in H 2 and F 2 molecules, the bond strength and bond lengths differ between H 2 and F 2 molecules. In methane (CH 4 ), the carbon atom undergoes sp 3 hybridization, allowing it to form four equivalent sigma bonds with hydrogen atoms, resulting in a tetrahedral geometry.