http://en.wikipedia.org/wiki/Periodic_table
http://www.chemicool.com/

As seen from the Periodic table every element has chemical, physical properties along with its atomic number, atomic weight. i.e Solid, Liquid and Gases.

Examples of Solids : Salt
Examples of Liquids : Mercury
Examples of Gases : Oxygen

In future if more elements viz metals are discovered for example during mining (extracting ores from earth's crust), gases are found during electricity power, nuclear power generation plants and liquids during mining (extracting water, oil, gas, minerals from earth's crust), laboratory experiments conducted in physics and chemistry, ocean engineering study, do we have to update the Mendeleev's Periodic Table after studying the particular element ?

Why there could not be a possibility of discovering new elements while studying oceans (Atlantic, Pacific and other oceans viz deep in the ocean), natural resources extraction from earth's crust viz water, coal, gas, minerals, oil etc, Galaxies - Stars by Astronomers ?.

http://en.wikipedia.org/wiki/Ocean_engineering
http://www.oceanicengineering.org/

Thanks & Regards,
Prashant S Akerkar

Salt is not an element.

Physics explains the patterns of behaviors seen in the periodic chart in terms of electron behavior and explains why it works so well with elements unknown to Mendeleev. The utility of the periodic table is ultimately limited not by a failure of electrons to behave in patterns but as a failure of nuclei to hold together at high atomic number. Ultimately fission becomes a preferred mode of nuclear decay and nuclear lifetimes drop below the characteristic time for electrons to fall to the ground state, so above a certain atomic number atoms don't exist in a meaningful way to chemistry.