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.).
The active ingredient in Scotts Halts Crabgrass Preventer, pendimethalin, kills at least nine varieties of weeds, not just crabgrass. To prevent winter weeds such as the annual chickweed (Stellaria media) and henbit (Lamium amplexicaule), apply the herbicide in the fall, just as the weather starts to cool.