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element in period 18(helium,neon,argon,krypton,xenon,&radon)

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That Na and Hg in vapour state exist as monoatomic molecules?

True. In their vapor state, both Na and Hg exist as monoatomic molecules, with Na being represented as Na and Hg as Hg. This is because in their gaseous form, both elements exist as individual atoms rather than diatomic molecules.


How many elements are found in the periodic table of elements?

There are a total of 118 elements known to exist on the periodic table.


What families have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


Does Na and Hg in vapour state exist as monoatomic molecule?

yes they exsist as monoatomic molecule in vapour state


What element family have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


What are monoatomic molecules?

Monoatomic means to have one atom. An anion is any ion that has a negative charge. An example of a monoatomic ion is S2- . Sulfur is the only atom in the atom, and it has a negative two charge.


Does neon exist in monoatomic gas at standard temperature and pressure?

No, neon exists as a monatomic gas at standard temperature and pressure. It does not readily form diatomic molecules or other larger clusters like some other elements.


Are most of the periodic table isotopes?

No most of them are not isotopes. Few elements exist as isotopes.


What number is mathane on the periodic table?

First of all it is a compound made of different elements, hence it cannot exist in periodic table. Periodic table is composed only of pure elements not in any combined form.


What particles exist within an atom?

The nucleus consisting of Protons and Neutrons surrounded by one to several "shells" of orbiting electrons. The numbers of protons and neutrons for each element can be found in the periodic table of elements.


Why do individual isotopes not appear on the periodic table?

In the periodic table only the chemical elements appear; but tables for isotopes also exist.


A verticle column in the periodic table?

In the Periodic Table of the Elements, a column (group) contains all elements that exist with the group number of electrons in the outer energy level of an atom of that element.