The Noble Gases: The Kings of The Periodic Table
By Christine Yakich
The Noble Gases of The Periodic Table
- He, Ne, Ar, Kr, Xe, Rn
- Very unreactive
- Stable s2p6 octet
- *He is considered a noble gas because it has 2 electrons in a full energy level!
Atomic radius decreases from left to right within a period because of effective nuclear charge . As you move from left to right in a period, you are still in the same energy level which means the electron is still the same distance from the nucleus. As you go down a group, the atomic radius increases because you are adding energy levels that are farther away from the nucleus.
Smallest to Largest:
The Noble Gases do not have an ionic radius . This is because they don't form ions. Ions are charged particles, and atoms become charged particles when they gain or lose electrons. Atoms only gain or lose electrons in an attempt to establish an octet, or 8 valence electrons. Octets are particularly stable electron arrangements. Noble gases already have 8 valence electrons (except for helium) and are in very stable states. They have no need to gain or lose electrons, so they are "happy".
No ions = no ionic radii.
Ionization energy increases from left to right within a period. Noble Gases have a very stable electron configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a family because electrons farther from the nucleus are easier to remove.
Largest to Smallest:
- Helium (highest ionization level in the periodic table)