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 defines several periods of limitations that define how long you need to keep the tax return. If you did not report income your parent received that you should have, and it is more than 25 percent of the gross income shown on the return, the IRS can look back 6 years. If the return that was filed had fraudulent information or a final return was not filed, there is no limit on the number of years the IRS can look at past returns.