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Around 1500 unstable nuclei (or radioisotopes).
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∙ 14y ago
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What makes a nucleus unstable?
The strong nuclear force doesn't balance the electrostatic force.
How many protons are in the nuclei of the phosphorus?
15 protons.
What is a nuclear explostion?
A nuclear explosion is the uncontrolled reaction (either fusion of fission) of nuclei and nuclei (fusion) or nuclei and neutrons (fission). Both processes produce vast amoutns of energy, as well as more nuclei or neutrons (for fusion or fission, respectively) to continue the chain reaction. This energy, if not moderated (such as in the case of a nuclear reactor, in which this reaction is harnased to produce electricity), explodes with a force many many times that of an equal quantity of dynamite (on the order of tens or even hundreds of thousands of times more force) or other conventional explosives.
Radioactivity is caused due to?
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. The most common types of radiation are called alpha, beta, and gamma radiation, but there are several other varieties of radioactive decay. Radioactive decay rates are normally stated in terms of their half-lives, and the half-life of a given nuclear species is related to its radiation risk. The different types of radioactivity lead to different decay paths which transmute the nuclei into other chemical elements. Examining the amounts of the decay products makes possible radioactive dating. Radiation from nuclear sources is distributed equally in all directions, obeying the inverse square law.
Which of these atoms has the greatest number of electrons?
Among the elements that occur in nature, it's Uranium, with 92 protons in the nucleus. Small amounts of atoms with higher atomic numbers are produced in particle accelerators. Their nuclei are unstable, and break down into nuclei with lower atomic numbers.
Why is a larger nucleus not as stable as a smaller nucleus?
A smaller nucleus is generally more stable. Below are some general rules: # (Except for really small nuclei) All stable nuclei contain a number of neutrons that is equal to or greater than the number of protons. # Nuclei with too few or too many neutrons is unstable. # If a nuclei has even numbers of nucleons, it's generally more stable. # Nuclei with "magic numbers" usually tend to be more stable.
What is radioactive decay in your own words?
It is when an atom's nucleus contains too many neutrons and becomes too unstable. Thus, the nucleus "wants" to become more stable and thus splits into two lighter nuclei. To get rid of the extra neutrons that were making the atom unstable, when the atom splits apart, these neutrons are ejected outwards. The two split nuclei become two separate, more stable atoms.
How many elements make landforms?
88 different elements exist in nature.
What is the difference between nuclear decay and nuclear fission?
Nuclear decay is any spontaneous process where unstable nuclei release extra energy to arrive at a more stable state. Typical decay processes are Alpha, Beta, and Gamma. Some large unstable nuclei (e.g. Plutonium-240) can sometimes decay by spontaneous fission.Nuclear fission is a process where certain large nuclei (e.g. Uranium-235 & Plutonium-239) absorb a neutron and then split into two smaller nuclei and a few free neutrons. Some large unstable nuclei (e.g. Plutonium-240) don't need to be hit by a neutron to fission.Nuclear fusion is a process where small nuclei under unusual conditions of very high temperature and very high pressure combine to form larger nuclei.All three processes above are exothermic.In stars nuclear fusion stops at nickel and iron (further fusion past this would be endothermic). If all we had was the above processes then that would be where the periodic table ended (therefore there could not be nuclear fission as such heavy nuclei could not exist). However stars die, and some die so spectacularly we call them supernovas.When a supernova occurs, an intense shock wave blows all the outer layers of the star away at very high velocity. At these velocities nuclei collide so hard that normally impossible endothermic nuclear fusion reactions occur. The rest of the periodic table is filled here, including many transuranics not found naturally on earth (e.g. Americium, Californium, Berkelium).
How many nucleus does smooth muscle have?
smooth muscles and cardiac muscles contain a single, centrally located nuclei, where as skeletal muscle cells are very large and contain many nuclei.
Why does your bed shake is it ghosts?
Your bed may shake for many reasons. 1. It may be unstable and rocky when you're in it 2. People nearby may shake you a bit if they are moving around a lot 3. Nature outside including storms can shake you. I do not know if ghosts exist or not, but I highly doubt it.
Under which conditions is a nucleus unstable?
When certain combinations of protons and neutrons form an atomic nucleus, there is the possibility that the nucleus may be unstable. There may be too few or too many protons for the number of neutrons present, or there may be too few or too many neutrons for the number of protons present. In any case, if the nucleus is unstable, that nucleus is said to be radioactive. There is another case in which a nucleus can be unstable, and that is that it is simply too large to be able to stay together. Recall that nuclear binding energy holds atomic nuclei together, and it overcomes the electromagnetic repulsion of the positively charged protons to do this. But when atoms become "really big" as we see them at the top end of the periodic table, they are uniformly unstable. They are all radioactive and will eventually undergo nuclear decay of some kind. In a radioactive substance, the instability of the nuclei of the atoms will eventually "win out" over the binding energy holding the nuclei together, and the nucleus will "fall apart" or even "split" in some cases. Is there a "magic number" associated with the disproportionality that will tell us if a given atom is unstable? No, there isn't. We have to look at things on a case by case basis. Recall that atoms of the same element that have differing numbers of neutrons in them are isotopes of that element. And for a given element, some unstable isotopes exist. They may appear in nature, or we may see them in the physics lab. In addition to the existence natural or synthesized radioactive isotopes of the elements, some elements have no stable isotopes whatsoever. That means all isotopes of those elements are radioisotopes, and are radioactive. You probably recall the element technetium, which has no stable isotopes. That's an example, and we see more examples at the "top end" of the periodic table where the nuclei of the elements are huge. The binding energy or nuclear glue holding the nuclei together is losing ground to the repulsive forces of all the positively charged protons. Eventually we'll reach a point where a massive nucleus won't stay together, no matter what.
Why do many atoms in nature tend to be found as ions rather than single atoms?
Most single atoms are unstable and must undergo a chemical reaction in order to become stable. The noble gases, however, can exist as single atoms, because they have filled valence shells and are therefore stable on their own.
Is hafnium combined or uncombined?
Pure hafnium doesn't exist in the nature; hafnium form many compounds.
Why would an atom become radio active?
Atoms of an element do not become radioactive, they are radioactive. This is because their nuclei are unstable. The nucleus of an atom contains protons and these are positively charged electrically. When you squeeze a lot of bodies with the same charge tightly together the charges repel one another strongly and the nucleus wants to (and does) fly apart. This is the driver for radioactivity. To enable the large atomic nuclei of the heavier elements to exist, you must space out the protons in the nucleus with neutral particles called neutrons. The presence of the neutrons and how many of them there are help stabilise atomic nuclei and slows down the rate of radioactive decay in certain configurations of packing.
Why can't all atoms exist independently while all molecules exist independently?
Many atoms have electron configurations that are unstable. By sharing electrons with one or more other atoms, new, more stable electron configurations form.
What is diplomonadia?
Most diplomonadia are double cells with two nuclei. They are a group of flagellates. Many diplomonadia are parasitic in nature. An example of a diplomonadia is Giardia lamblia which causes giardiasis in humans.
