It has 7 valence electrons, so needs 1 more to become noble.
Se has to gain two electrons
Oxygen should gain 2 electrons to achieve noble gas configuration
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.
1 electron
They should gain 2 electrons to attain noble gas electronic configuration. (it doesn't become a noble gas as the number of protons are not same)
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 should gain 2 electrons to achieve noble gas configuration
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
They have to gain 1 electron. Halogens have 7 electrons in their valence shell and noble gasses have 8.
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.