2
An ion can give or receive electrons to achieve a stable electronic configuration. Positively charged ions, called cations, typically give away electrons, while negatively charged ions, called anions, receive electrons.
nitrogen should give 5 electrons (or better gain 3 electrons) to attain noble gas configuration.
Calcium has to lose 2 electrons to form noble gas configuration.
An atom of nitrogen needs 3 more electrons to achieve a stable, noble gas electron configuration. This would give nitrogen a total of 8 valence electrons, making it isoelectronic with a noble gas (in this case, neon).
2
Barium has 2 valence electrons. It needs to give up these 2 electrons to achieve a noble gas electron configuration, specifically by having a filled outer shell like a noble gas.
Two electrons
Barium has 2 electrons in its outermost shell. To achieve a noble gas electron configuration similar to xenon, which has 8 electrons in its outermost shell, barium would need to give up 2 electrons. This would leave barium with a full outer shell and a stable electron configuration.
Barium has 2 electrons in its outer shell. In order to achieve a noble gas electron configuration it needs to lose these 2 electrons. This will leave it with the same electron configuration as Xenon, a noble gas.
Atoms can give away electrons to achieve a stable configuration by filling their outermost energy levels. This can happen when an atom has excess electrons or when it is more stable when losing electrons to achieve a full outer shell. This exchange of electrons helps atoms achieve a more stable state through the formation of bonds.
Boron has 5 electrons in its outer shell, and it needs to give up 3 electrons to achieve a stable electron configuration, which is the same as the nearest noble gas, helium.
An ion can give or receive electrons to achieve a stable electronic configuration. Positively charged ions, called cations, typically give away electrons, while negatively charged ions, called anions, receive electrons.
nitrogen should give 5 electrons (or better gain 3 electrons) to attain noble gas configuration.
4 but it will need energy, so carbon gain 4 electrons to achieve a noble gas configuration.
Berilium, Magnesium, Calcium, Strontium, Barium and Radium
Calcium has to lose 2 electrons to form noble gas configuration.