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 in Chemistry
Among those who believe in ghosts, there are many different opinions as to what they actually are and why they exist. According to About.com, the traditional belief is that ghosts are the spirits of dead people who have become trapped between their human life and the next plane of existence. Those who become ghosts typically suffered a tragedy or trauma in their human lives that contributed to this entrapment.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 >
Scientists have not been able to prove that Bigfoot exists, according to Discovery News. Although many people claim to have seen Bigfoot and scientists have conducted thorough investigations, there is no hard evidence, such as hair samples, bones or fossils preserved in forest soil, that Bigfoot exists.Full Answer >
There is no scientific or substantial evidence that angels exist. Although thousands of people purport to see angels each year, scientists believe these encounters with angels are a survival mechanism of the brain and not winged guardians.Full Answer >