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PDF Editor FAQ
If humans depleted Earth of an element entirely, would that element be removed from the periodic table?
I'll take on older periodic table, because it is more obvious:Notice the row the third from the bottom? And how they were all called Uu[X]? Those atoms were made and existed for fractions of seconds. They were called ununillium, unonoctium, etc. Those names were obvious placeholders until they were officially named. The most long-lived isotope of moscovium to have existed only lasted 650 ms. It doesn't exist right now (as far as we know), but it's still in the periodic table. The periodic table is a representation of the possible combinations of protons, neutrons and electrons, not of the existing ones.Here's the newest periodic table, with all the updates names:
Let's say you have a block of gold. What would happen if you removed an atom from it?
(EDIT: The original question was: "Let's say you have a block of gold. What would happen if you removed an atom from it?")You would continue to have a bar of gold in one hand and a worthless (but interesting to study with an electron microscope) atom of gold in your other.If you removed a proton from an atom of the bar (impossible to do), you would have a bar of gold with an atom of very unstable platinum - the next element down on the periodic table - that would rapidly decay via neutron and electron ejection into the next stable state/isotope/element with no noticeable effects to you.
Why is technetium, atomic number 43, the only radioactive element in a sea of non-radioactive elements on the periodic table?
Why is technetium, atomic number 43, the only radioactive element in a sea of non-radioactive elements on the periodic table?Ah, but it’s not.Technetium was a “hole” in the periodic table; in the early 1900s there was no element known with the atomic number of 43. And there was another hole just like it, at #61. No elements there.When they were synthesized later in the century, they were given the names technetium and promethium. The are unique that there are no stables forms of either, they both decay in all of their isotopes, and the half-life of each is less than the minimum 100 million years that sees some primordial element still on our world. The only sources for either before 1930 was as fission products of elements that very occasionally spontaneously fission. It is estimated that 18,000 tons of technetium from that source spread out in the Earth’s crust.As for them being “the only radioactive element[s] in a sea of non-radioactive elements on the periodic table?”, that’s not exactly truee. Look at this diagram of the elements and their isotopes:All the squares on the grid are theoretical possibilities for isotopes, but the empty gray squares are possibilities that will decay in less than a second to a different square. Everything will in short order be concentrated down to the colored squares. The elements are represented by vertical columns; if you look closely you can find technetium (43) and promethium (61). As you can see, the stable isotopes (the black squares)are pretty much immersed in a sea of instability. There are many elements that have only one stable isotope, like beryllium, fluorine and sodium.
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