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:
Statute of Limitations. Federal law sets limits, known as collection statute expiration dates, on how long the IRS can collect back taxes from taxpayers. After the expiration date passes, the IRS can't try to make you pay your old taxes. According to the Internal Revenue Code, the length of time the IRS can take collection action against you for back taxes is 10 years after the tax was assessed. You can find out what date a tax was assessed against you by requesting a transcript of your tax history from the IRS.