How many elements have been discovered and are there any missing from the Periodic Table?

117 elements have been discovered. Their atomic numbers range from 1 to 118 but element 117 remains undiscovered so far ("is missing from the periodic table.")

This is not really a question a Chemist is likely to think is important, because except for a few elements, even nuclear chemists ignore the f-block elements. For us "discovered" would mean "to find in nature". This question: "How many elements exist in nature?" was asked elsewhere on this site. (The answer given was 92.)

Most of the elements that have been "discovered" lately have actually been made by nuclear physicists. As indicated above, some of those exist only for a very brief time. Many of us chemists regard the production of these new elements as an expensive game that has not borne much fruit in the way important new insights for a good while now. Nuclear physicists will probably see it differently, and the general public still seems interested in what the "number" of elements (including the man-made ones) is.

There are elements in the periodic tables which do not exist naturally on earth because they are not stable;for example 43 technetium(it's radioactive),but before the age of atomic energy it was included in the same place in the table,and it's chemical nature was deduced but under the name'Masurium'There may well be others but I'm pretty sure there are many more elements known through nuclear research but many have half lives in small fraction of seconds,but they still have 'names'.Incidentally I think polonium is one of them it gives out energy at something like 20 kw per gram.because of it's short half-life.

there are 118 elements in the periodic table.. there are still blank spaces in it for the other elements that could soon be discovered..

each and every element from a million via ninety two has been got here upon, or for ninety 3-117 has been created. there have been no gaps when you consider that beforehand WW2 Are you speaking approximately isotopes of particular factors? no longer all isotopes are a danger

I think there are 110, but i'm not 100% sure. there are some elements which are too unstable to hold together for more than a couple of nano-seconds.

about 110

there are none missing that i know about but there are manmade elements that don't last long, so more could be added i the future i think

There always used to be some missing but since they fitted it

with a strong plastic cover and a stout padlock it`s been ok.

I have no clue to guess about it