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 retention periods apply to records needed to substantiate your federal income tax return and are generally based on the federal statute of limitations, which is normally three years. This means the IRS could audit your return up to three years from the due date of the tax return or the date of filing, whichever is later. However, if you substantially underreport income, fail to file a return or file a fraudulent return, the statute of limitations could be much longer.