The number of possible elements is not known. A very early suggestion made by Elliot Adams in 1911, and based on the arrangement of elements in each horizontal periodic table row, was that elements of atomic weight greater than 256Â± (which would equate to between elements 99 and 100 in modern-day terms) did not exist.
IRS debts can only legally be collected for 10 years, but there are many events that may stop that 10 year clock from running. This is known as tolling the statute of limitations. Events that stop or toll the statute of limitations from running include:
The IRS recommends taxpayers keep their returns and any supporting documentation for 3 years after the date of filing; after that, the statute of limitations for an IRS audit expires. If you've under-reported income by 25 percent , however, the IRS can go 6 years back, or 7, if you claim a loss for bad debt or worthless securities. If you don't file, or if you file a fraudulent return, the IRS has no statute of limitations; so it may be best to keep your records indefinitely. State documentation requirements. If you're paying state income taxes, the time you need to keep records will vary, depending on the particular state's laws.