noble gases
Helium has 2 valence electrons, whereas the rest have 8.
The alkaline earth elements electron structure end in s2
nitrogen will get noble gas configuration by adding three more electrons.
Elements in the same column on the periodic table have similar chemical reactivity because they have the same outer electron configuration and it is the electron structure that determines an elements properties.
All elements in group 16 share similar properties because their valence shells all contain the s2p4 electron configuration.
There are no similarities. Noble gases (group 18 elements) have completely filled orbitals with stable electron configuration and are generally unreactive. Alkali metals (group 1 elements) have one valence electron. They are reactive. When these lose one electron, they form ions which has the electronic configuration of the nearest noble gas.
The group of elements that have a stable electron configuration are the noble gases.
1
these elements have 5 electron in the valence shells and have configuration of ns np5
All elements tend to react with other elements so as to attain a noble gas electronic configuration in their ions, because such a configuration usually has the lowest energy for a particular atom or ion, other factors being equal. The drive to form such an ion is strongest when the electron configuration of an elemental atom differs from the closest noble gas configuration by only one electron, and this criterion is true for both group and group 17 elements: Group 1 elements can attain a noble gas electron configuration by donating one electron to another atom, and Group 17 elements can attain a noble gas configuration by accepting one electron, thereby filling their valence shell.
The alkaline earth elements electron structure end in s2
Electron Configuration
In the modern periodic table, these elements belong to group 17. These elements have s2 p5 electron configuration. Hence they need one more electron from an electron donor to fulfill its valence shell to obtain noble gas configuration.The elements in the group 7A has 7 electrons in their outermost energy level. They gain 1 electron to get the noble gas configuration. The elements in the group 7A are called halogens.
Only group 18 elements have noble gas configuration. All other elements lack a noble gas electronic configuration.
nitrogen will get noble gas configuration by adding three more electrons.
All elements in group 1 have 1 valence electron.
All of the elements in group 8A have this electron configuration except for He! (So a total of 5 elements)
All elements from group 1