1. In general, most actinide isotopes with an odd neutron number are fissile. 2. Neutron number is primarily of interest for nuclear properties.3. Nuclides that have the same neutron number but a different proton number are called isotones. 4. Neutron number increases along the line of beta stability at a faster rate than atomic number.5. "' Isotopes "'are variants of a particular chemical element which differ in neutron number . 6. The neutron number has large effects on nuclear properties, but its effect on chemical properties is negligible for most elements. 7. Because positron emission decreases proton number relative to neutron number , positron decay happens typically in large " proton-rich " radionuclides. 8. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol.9. The nucleus consists of Z protons, where Z is called the atomic number, and N neutrons, where N is the neutron number . 10. Neutron numbers for which there are two primordial nuclides are 88 ( 151 Eu and 152 Gd ) and 112 ( 187 Re and 190 Pt ).
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