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.).
2. Spray the marigolds with the insecticide until all plant surfaces are wet. This will control sap-sucking insects such as aphids, thrips and spidermites. Repeat the treatment at 7 to 10 day intervals as needed. Kill chewing insects -- such as leaf-eating caterpillars -- by liberally spraying the marigold with a mixture of 4 teaspoons of Bacillus thuringiensis mixed with 1 gallon of water.