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  2. Cation-anion radius ratio - Wikipedia

    en.wikipedia.org/wiki/Cation-anion_radius_ratio

    The radius ratio rule defines a critical radius ratio for different crystal structures, based on their coordination geometry. [1] The idea is that the anions and cations can be treated as incompressible spheres, meaning the crystal structure can be seen as a kind of unequal sphere packing .

  3. Pauling's rules - Wikipedia

    en.wikipedia.org/wiki/Pauling's_rules

    An octahedron may then form with a radius ratio greater than or equal to 0.414, but as the ratio rises above 0.732, a cubic geometry becomes more stable. This explains why Na + in NaCl with a radius ratio of 0.55 has octahedral coordination, whereas Cs + in CsCl with a radius ratio of 0.93 has cubic coordination. [5]

  4. IRS tax forms - Wikipedia

    en.wikipedia.org/wiki/IRS_tax_forms

    The first Form 1040 was published for use for the tax years 1913, 1914, and 1915. For 1916, Form 1040 was converted to an annual form (i.e., updated each year with the new tax year printed on the form). [3] Initially, the IRS mailed tax booklets (Form 1040, instructions, and most common attachments) to all households.

  5. Tax Checklist: See the 5 IRS Tax Forms You’ll Need to Get ...

    www.aol.com/tax-checklist-see-5-irs-110052314.html

    If you have a simple return and are used to filling out Form 1040-EZ or Form 1040-A, you might be surprised to find that you now need to file Form 1040. All three IRS forms have been consolidated ...

  6. Tax returns in the United States - Wikipedia

    en.wikipedia.org/wiki/Tax_returns_in_the_United...

    Other popular tax software includes: TaxACT at 7%, Tax Hawk (including FreeTaxUSA) at 5.9%, Credit Karma's free tax software (now owned by Intuit/TurboTax) at 1.7%, and TaxSlayer at 1.5%. [ 6 ] In some countries, the tax agency provides a prefilled return to streamline the process, but the United States has failed to adopt these technologies as ...

  7. Free File - Wikipedia

    en.wikipedia.org/wiki/Free_File

    The IRS Free File Program is a service that allows U.S. taxpayers to prepare and e-file their federal income tax returns for free. Through the program, commercial tax software companies that are part of the Free File Alliance offer free tax preparation software to tax filers with annual adjusted gross income (AGI) below $73,000 for Tax Year 2022.

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  9. Treasury regulations - Wikipedia

    en.wikipedia.org/wiki/Treasury_regulations

    Treasury Regulations are the tax regulations issued by the United States Internal Revenue Service (IRS), a bureau of the United States Department of the Treasury.These regulations are the Treasury Department's official interpretations of the Internal Revenue Code [1] and are one source of U.S. federal income tax law.

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