All the isotopes of plutonium has 94 protons and 94 electrons. For the number of neutrons of a specified isotope: number of neutrons = rounded atomic mass of the isotope-atomic number (or protons number).
Canada thistle can be killed with either Roundup or 2,4-D weed killers. These weed killers will kill back the leaves on the plant and will kill back some of the root system. The best time to apply these weed killers is on sunny days when the temperatures are between 65 and 85 degrees F. (18-29 C.).hese weed killers will kill back the leaves on the plant and will kill back some of the root system. The best time to apply these weed killers is on sunny days when the temperatures are between 65 and 85 degrees F. (18-29 C.).
Mix Herbicide Spray. You can achieve 76 to 100 percent root kill by spraying with a mixture of the herbicides Reclaimâ¢ and Remdyâ¢. To ensure a thorough coating of the foliage, add either liquid dishwashing detergent or a non-ionic surfactant to the spray mix (see table).