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:
If you e-file, you can check after 24 hours. If you do a paper-based return, wait four weeks. The IRS states that the online tool is only updated once every 24 hours, so there is no need to check it more often. In general, you can expect your refund about 21 days after you e-file. As I mentioned above, if you haven't received your refund within this time frame, it's time to give the IRS a call.