FNMA will allow the origination of Temporary QM Rebuttable Presumption loans, however these loans. are limited to 45% debt-to-income ratio regardless of the ratio provided on the DU approval. If youâll. remember from our last video, a rebuttable presumption loan is a loan in which the APR exceeds the.
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element.The nuclei of most atom s contain neutrons as well as protons.n atom of carbon-14 contains 6 protons and 8 neutrons and is denoted 14 C. Over time, 14 C decays into 12 C. Sometimes the isotope of an element is denoted by writing the nucleon number after the chemical symbol, and not as a superscript.
There are over 1,000 known radioactive isotopes of elements in the periodic table. There are many applications of radioactive isotopes in various fields. In this lesson, we will learn all about radioactive isotopes and their uses. Before we go into discussing radioactive isotopes, let's recall what an isotope is. Let's look at the picture of an atom below. It has a nucleus made up of protons and neutrons, with electrons around the nucleus. All the atoms of an element have the same number of protons, but the number of their neutrons can differ.