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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 .
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]
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.
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 ...
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 ...
Short title: 2018 Form 1040: Image title: U.S. Individual Income Tax Return: Author: SE:W:CAR:MP: Keywords: Fillable: Software used: Adobe LiveCycle Designer ES 9.0
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