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What is octet configuration?
Octet configuration refers to how elements generally prefer to form bonds so as to attain an octet configuration, i.e. have 8 electrons in their valence shell. For example, chlorine (Cl) is from Group VII and has 7 valence electrons. It will gain one electron (eg from sodium which loses one electron to form Na+) to form Cl-, which has 8 valence electrons and so fulfills the octet rule and is stable. The electronic configuration of sodium is 2.8.1 (if you're in secondary school), or 1s2,2s2,2p6,3s1 (more advanced). So by losing one electron to form Na+, sodium also attains octet configuration.
How many electrons does lithium need to add to satisfy the Octet Rule?
Seven electrons should be added to attain the higher noble gas configuration.
How many valence electron does Ca lose or gain to attain noble-gas electron configuration?
Calcium (Ca) has 2 valence electrons. It needs to lose these 2 electrons to attain a noble gas electron configuration, which is the stable octet configuration found in noble gases.
Why does aluminium chloride have a low melting point?
Maybe because aluminum atom in Alcl3 does not attain octet arrangement... thus, it undergoes dimerisation to produce al2cl6, where the aluminum atom achieve an octet electronic configuration.
How many electrons does sulfur gain to attain a noble gas configuration?
Sulfur gains two electrons to attain a noble gas configuration, which is the electron configuration of argon. This allows sulfur to have a stable octet of electrons in its outer shell and achieve a more stable electron configuration.
