When an atom's outer shell of rlectrons is full, it becomes non reactive and stabilized. Not every atom can gain an octet though. Hydrogen only has an S1 suborbital and therefore only holds 2 electrons stabley. If 6 extra electrons are forced on, which is EXTREMELY difficult and unnatural, then yes you achieve an octet, but the electrons will leave quickly and the hydrogen will react.
The outer electron shells of the halogens contain seven electrons, and need one more electron to have eight and become stable.
No. The inner shells are filled first.
Each halogen element has an outer shell that lacks one electron of being full.
Berkelium has two electrons on the outer shell.
They all have 0NE electron in their outer shell: called s-electron. That's why they belong to group 1
The outer electron shells of the halogens contain seven electrons, and need one more electron to have eight and become stable.
Atoms with outer electron shells that contain 8 electrons tend to be stable and chemically in reactive, or inert.
francium only has one valence electron (one electron in the outermost shell).
1 valence electrons 2 full outer shells (electron levels) 3 outer shells (electron levels)
These atoms are very stable and unreactive.
Chromium has two electrons in the outer most shell.
No. The inner shells are filled first.
Each halogen element has an outer shell that lacks one electron of being full.
Darmstadtium has seven electron shells around the nucleus.
Berkelium has two electrons on the outer shell.
Californium has seven electron shells ; the outer shell has two electrons.
http://en.wikipedia.org/wiki/Valence_shell#Valence_shells