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.).
Cover the creeping thistle growth area with an opaque weed screen cloth or sheet of plastic. Cover every single plant and ensure light cannot reach them. Anchor the ground cover with large stones or landscape staples. Leave the cover on the ground for an entire growing season.ip. 1  Avoid using glyphosate herbicides or other poisons for creeping thistle control. 2  Creeping thistle resembles a rare native thistle in the Yukon area of Canada called Elk thistle.