Radioisotopes are radioactive (unstable) and breakdown over time. The nucleus is "uncomfortable" with the additional neutrons, so over time, they are broken off or released, which inturn releases short wave energies. Normal isotopes do not behave in their manner.
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It has 84 protons and 126 neutrons. By Edwin Rollins
The first isotope is deuterium, H-2, comprising a proton, an added neutron, and an electron.
istope
Uranium is a non metal element. Atomic number of it is 92.
Example with the istope 235 of uranium: - 235 92U (recommended) or - U-235
Smoke detectors commonly use the isotope americium-241. This radioactive isotope emits alpha particles, which help ionize the air in the sensing chamber, allowing the detector to detect smoke particles. When smoke enters the chamber, it disrupts the ion flow, triggering the alarm. Americium-241 is favored due to its relatively long half-life and effective ionization properties.
- the same chemistry, the same number of electrons and protons - except for different numbers of neutrons in the nucleus. Examples are 12C and 14C (6 and 8 neutrons) and 235U and 238U (146 and 143 neutrons).
Carlsbad Caverns began forming approximately 250 million years ago, with the majority of the cave's development occurring during the last 5-10 million years. The caves were formed by sulfuric acid dissolving the surrounding limestone bedrock to create the magnificent caverns we see today.
A typical chromium atoms has 28 neutrons. Because electrons are so small, virtually all of the atomic mass comes from the protons and neutrons. By subtracting the number of protons (equal to the atomic number) from the total atomic mass, the number of neutrons is obtained. For chromium atomic mass- 52 atomic number (number of protons) - 24 number of neutrons 52-24=28
Rubidium is the twenty-third most abundant element in the Earth's crust. It occurs in the minerals pollucite, carnallite, leucite and lepidolite, from which it is recovered commercially. Potassium minerals and brines also contain this element and are a further commercial source.
The answer is "which istope of what element?" An isotope of an element is an atom of that element that has the correct number of protons (the "atomic number") which defines the element, and one of a variety of numbers of neutrons. The number of protons plus the number of neutrons in the atom determine the "atomic mass" of that isotope of that element. A "standard" atom of carbon, for example, has 6 protons and 6 neutrons, for an atomic mass of 12 (hence it is called carbon 12) Another isotope of carbon is carbon 14, which has 6 protons to define it as carbon, but has 8 neutrons. It is the same element, with the same chemical properties, but a slightly different mass. The "standard" atom of fluorine has an atomic mass of 19 and an atomic number of 9. This is the only stable sotope of fluorine. Other isotopes can be made, but they decay very rapidly, splitting in to lighter elements and emitting energy as radiation.