+2
A neutral calcium atom that loses two electrons has a +2 charge.
An ionic bond is formed between a metal and a non metal. The METAL loses an electron (or electrons) and it becomes positively charged.
Argon doesn't have an ionic charge because it is a noble element which means that it neither gains nor loses electrons. Note- see octet rule :)
Two are lost by magnesium (which are in turn gained by the oxygen).
Potassium is a group 1 metal and is highly reactive. It readily loses electrons and forms ionic bonds. Bonds formed by potassium are almost 100% ionic. In the case of K2SO4, potassium loses the electrons and sulphate ion gains it.
+2 (plus 2)
An ionic bond.
A neutral calcium atom that loses two electrons has a +2 charge.
ionic compound
An ionic bond is formed between a metal and a non metal. The METAL loses an electron (or electrons) and it becomes positively charged.
When an atom gains or loses electrons and therefore becomes an ion, it takes on either a positive or negative charge (positive if it lost electrons, negative if it gained electrons) and can bond to ions of the opposite charge in an ionic bond.
Calcium, Ca, forms ionic bonds. It loses electrons to become the Ca2+ ion
Argon doesn't have an ionic charge because it is a noble element which means that it neither gains nor loses electrons. Note- see octet rule :)
An ionic bond forms from the transfer of electrons. The atom that loses one or more electrons forms a positively charged ion, and the atom that gains one or more electrons forms a negatively charged ion. The ionic bond is formed by an electrostatic attraction between the oppositely charged ions.
ionic
loses 2 electrons to form a calcium ion with 2+ charge
An ionic bond.