Isotopes exist because the atomic nuclei of many elements are stable or somewhat stable with different numbers of neutrons in them. Because the identity of an element is determined solely by its number of protons, and its chemical properties solely by its number of protons and electrons, different numbers of neutrons change neither the element nor its chemical properties. Nonetheless, many isotopes are radioactive and unstable, breaking down in time.Know More
Radioactive isotopes are the most famous, both for their inherent dangers and their use in nuclear power and nuclear weapons. These isotopes are unstable, which means that over time, any particular sample of such an isotope gradually transforms into one or two other elements. This can occur because the atom splits or because a neutron becomes a proton or a proton becomes a neutron. All these processes involve the release of energy or energetic particles, and thus are radioactive. Most radioactive isotopes are so unstable that they are not found in nature, as they decay too quickly.
According to resources on the University of Oregon website, before 1906, it was generally thought that the mass of an element was integral to its identity. However, in 1906 and 1907, several researchers proved that there were elements of different atomic mass but identical chemical properties. It was Frederick Soddy, in 1913, who first coined the term "isotopes."Learn more about Chemistry
Mermaids have existed in folklore since antiquity, but there has never been a verified sighting of a mermaid, nor has a purported mermaid body ever been verified as genuine. While it is impossible to prove that mermaids do not exist somewhere, there is no scientific evidence to support their existence.Full Answer >
Two of the basic reasons businesses exist are to provide society with goods and services and to make a profit. The latter motive is what separates them from government agencies and charities. Businesses also serve to establish and promote social cooperation, as noted by University of Virginia Professor Ed Freeman.Full Answer >
Trolls, supernatural beings in Norse myth and North European folklore, are imaginary, not real. These frightening monsters have transformed from the non-Christian humanoid enemies of the Scandinavians into fantasy fiction's giant, indestructible brutes.Full Answer >
The megalodon became extinct about 2.6 million years ago during the Cenozoic Era. Due to loss of habitat and lack of viable food sources, it is extremely unlikely that any megalodon exist today. There is no scientific evidence to suggest it.Full Answer >