It will vary depending on the noble gas.
helium has 2, neon has 10, argon has 18, krypton has 36, xenon has 54, radon has 86.
Oxygen should gain 2 electrons to achieve noble gas configuration
It should loose 2 electrons to become a noble gas.
Krypton is a noble gas and need not lose electrons. It is already stable.
Krypton is a noble gas with 36 electrons.
equal numbers of protons and electrons
Oxygen should gain 2 electrons to achieve noble gas configuration
It should loose 2 electrons to become a noble gas.
Krypton is a noble gas and need not lose electrons. It is already stable.
Krypton is a noble gas with 36 electrons.
8.
Oxygen needs to gain 2 electrons to achieve a noble gas configuration, as it has 6 valence electrons and wants a full valence shell of 8 electrons, like a noble gas.
it should gain 3 electrons
equal numbers of protons and electrons
Strontium has 38 electrons. It needs to give up 2 electrons to achieve a noble gas electron configuration, similar to the nearest noble gas, which in this case is krypton (36 electrons).
Calcium will lose two electrons to gain the noble gas configuration of Argon.
It has 7 valence electrons, so needs 1 more to become noble.
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).