Neon, Argon, Krypton, Xenon, Radon, Ununoclium.
These are the noble gases.
The outermost shell of an element, called the valence shell, determines the chemical properties of the element. The number of electrons in the valence shell influences how atoms bond with other atoms to form molecules.
If the element has a full valence shell, such as the noble gases, then it is unreactive. It the element is missing few valence electrons of has few valence electrons, then the element is very reactive, such as the sodium.
the element with seven valence electrons will be more reactive. The reason for this is that elements want to always want to have a full valence shell (they always want 8, like a noble gas). The element with eight valence electron is happy with its full shell and will not want to get rid of any electrons.
An element with a complete valence electron shell is a noble gas. Noble gases have a full outer electron shell, making them stable and non-reactive. Examples include helium, neon, and argon.
An element that does not require eight electrons for a full set of valence electrons is represented by the element symbol B. Boron only needs six electrons to complete its valence shell and achieve stability.
No, oxygen, as a nonmetal element, cannot have an expanded octet in its valence shell.
Oxygen typically exists as a divalent element because it has six valence electrons in its outer shell. By gaining two electrons, it can achieve a full valence shell, similar to the stable noble gases.
the elements having full valence shell donot react as they are inert in nature.
The element with 4 valence electrons in the 6th shell is lead (Pb). Lead has 4 electrons in its outermost shell, which is the 6th electron shell.
Helium. (A hydride ion has the same electronic configuration, but hydride is not an element since it has a net electric charge.)
The element with a stable 2 valence electrons is helium. Helium has a full outer electron shell with 2 electrons, making it very stable and unreactive.