Gold, platinum metals (platinum, palladium, osmium, rhodium, ruthenium, iridium), rhenium, etc.
No, potassium does not have more electrons than uranium. Potassium has 19 electrons, while uranium has 92 electrons. This is because the atomic number of an element determines the number of protons and electrons it has, and uranium has a higher atomic number than potassium.
The element with the largest amount of protons that is not man-made is uranium, with 92 protons. All naturally occurring elements with more protons than uranium are only found in laboratories as synthetic elements.
Polonium is more radioactive than uranium, as it emits alpha particles that are highly energetic. However, uranium is more explosive due to its ability to undergo fission reactions, which release a large amount of energy quickly.
An element is classified as a transuranium element if its atomic number is greater than 92, which is the atomic number of uranium. These elements are all synthetic and are typically produced in laboratories through nuclear reactions. They are highly unstable and have very short half-lives.
The number of protons that an element has defines what that element is, regardless of the number of neutrons it has. Therefore, the chemical element having 82 protons, which is lead, or Pb, can take many different forms. In fact, there are 38 different known isotopes of lead, ranging from having 96 neutrons to having 133 neutrons. Despite that, they are all still called lead.
Uranium is a chemical element, not a compound.
polonium, radium, plutonium and many others
radium
Studying residues of uranium ores Marie Curie found that these residues are more radioactive than uranium; she attributed this radioactivity to an unknown element. She isolated this element and named this element polonium.
Radium (Ra)
No, potassium does not have more electrons than uranium. Potassium has 19 electrons, while uranium has 92 electrons. This is because the atomic number of an element determines the number of protons and electrons it has, and uranium has a higher atomic number than potassium.
Uranium is a radioactive element; uranium is also a toxic element. But the nuclear energy based on uranium is cleaner than the energy based on coal or oil.
Try buying Uranium or Plutonium.
Radium (Ra)
Uranium is around us: in rocks and minerals (more than 200 minerals contain uranium), in soils in all waters including the tap water, in the atmosphere, building materials, vegetation etc. Uranium is not a so rare chemical element.
Uranium is more dense than lead, yes. The density of the two metals is 19.1 and 11.34 grams per cubic centimeter, respectively. That makes uranium almost twice as dense as lead.
Studying residues of uranium ores Marie Curie found that these residues are more radioactive than uranium; she attributed this radioactivity to a new element. She isolated this element and named polonium.