Se has to gain two electrons
Oxygen needs to gain 2 electrons to achieve a stable octet, like a noble gas.
Calcium will lose two electrons to gain the noble gas configuration of Argon.
A nitrogen atom needs to gain three electrons to achieve a stable electron configuration similar to a noble gas. This would result in the nitrogen atom having a full outer electron shell, like that of a noble gas.
nitrogen should give 5 electrons (or better gain 3 electrons) to attain noble gas configuration.
Group 6A elements have 6 valence electrons and need to gain 2 electrons to achieve a full octet and become stable like a noble gas.
it should gain 3 electrons
A sulfur atom will gain 2 electrons to achieve a noble gas structure because sulfur is in group 16 of the periodic table and needs to fill its outer shell with a total of 8 electrons to become stable.
Se has to gain two electrons
nitrogen has 5 valence electrons. It should gain 3 electrons to achieve a noble gas configuration.
Oxygen needs to gain 2 electrons to achieve a stable octet, like a noble gas.
Nitrogen has to gain three electrons
Nitrogen needs to gain 3 electrons to achieve noble gas electron configuration, similar to the nearest noble gas, which is neon. By gaining 3 electrons, nitrogen would have a full outer shell of 8 electrons, making it more stable.
3
Halogens have seven valence electrons and need to gain one electron to achieve a stable noble gas electron configuration, similar to the nearest noble gas in the periodic table.
Calcium will lose two electrons to gain the noble gas configuration of Argon.
An atom of silicon needs to gain 4 electrons in its 3p sublevel to attain the noble gas electron configuration of argon, the noble gas in period 3 of the periodic table.