It should loose 2 electrons to become a noble gas.
Selenium should gain two electrons and lose six electrons to achieve a noble gas electron configuration.
Magnesium (Mg) has 12 electrons. To attain a noble gas configuration, Mg would need to lose 2 electrons to have the same electron configuration as a noble gas (like neon). This would result in Mg forming a +2 ion.
All should lose 2 electrons to attain the nearest noble gas configuration
Krypton is a noble gas and need not lose electrons. It is already stable.
It should loose 2 electrons to become a noble gas.
Selenium should gain two electrons and lose six electrons to achieve a noble gas electron configuration.
Calcium's electron configuration is [Ar] 4s2. To attain a noble gas configuration, calcium must lose 2 electrons to have the same electron configuration as argon, 4s2 3d10.
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.
Calcium (Ca) has 20 electrons in its neutral state. To attain a noble gas electron configuration (like argon), calcium would need to lose 2 electrons to have the same electron configuration as argon, as argon has 18 electrons.
Magnesium (Mg) has 12 electrons. To attain a noble gas configuration, Mg would need to lose 2 electrons to have the same electron configuration as a noble gas (like neon). This would result in Mg forming a +2 ion.
All should lose 2 electrons to attain the nearest noble gas configuration
Krypton is a noble gas and need not lose electrons. It is already stable.
Se has to gain two electrons
It should lose two electrons
Iodine, located in Group 17 of the periodic table, has 7 valence electrons. To achieve a noble gas electron configuration (like Xenon), it must gain 1 electron to fill its valence shell and attain stability.
1 electron