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
Organizations exist for different purposes, including meeting the objectives of external stakeholders, a community or a market segment. Others are formed to engage or utilize collective abilities. Business-oriented organizations are formed to make and maximize profits. Community-based organizations are formed to empower members and the community.Full Answer >
There is no scientific evidence to suggest that people significantly larger than the tallest normal human being ever existed. However, a condition of the pituitary gland called "agromegaly" can result in the excessive production of human growth hormone. Sufferers of agromegaly can grow to well over 8 feet in height.Full Answer >
Although many religions teach of an afterlife called Heaven, there is no direct evidence to prove a heaven actually exists. The idea of giving a location to the afterlife is a popular religious tradition.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 >