2
All should lose 2 electrons to attain the nearest noble gas configuration
Calcium will lose two electrons to gain the noble gas configuration of Argon.
Ca must lose 2 electrons to have a complete 3n shell, which has 8 valence electrons. The ion would have a charge of 2+: Ca^2+.
Calcium (Ca) typically loses 2 electrons to become more stable when bonding, as it has 2 valence electrons in its outer shell. By losing these electrons, calcium achieves a full octet, making it more stable.
Calcium (Ca) has 20 electrons and its electron configuration is [Ar] 4s². To attain a noble gas electron configuration, calcium needs to lose two electrons to achieve the stable electron configuration of argon ([Ar] 4s² 3d¹⁰).
The calcium atom (Ca) loses two valence electrons to form a calcium ion (Ca2+).
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.
Calcium loses two electrons to obtain a noble-gas electron configuration.
Two
Calcium is in group 2 of the periodic table, meaning that it has 2 electrons in its (outer) valence shell. So it 'only' has to lose those 2 electrons from that to acquire Argon's noble gas structure Ar(2,8,8)Ca(2,8,8,2) --> Ca(2,8,8,0)2+ + 2e-
Polonium can lose two or four electrons.
it will lose 3 electrons