There isn't a specific rule
There is no rule about this. Gold is a very stable metal, and neon is a very stable non-metal.
metals generally form positively charged ions
Metals and non-metals combine through a sort of extreme electron sharing called ionic bonding. In ionic bonds, the metal atom is said to lose one or more of its electrons and give it to the nonmetal.
The metal loses its electrons and trannsfers them to the non-metal to form an ioinic bond.
non metal
metal and non metal combined.
Alloys would be formed when metal will be combined with non metals.
Ionic compound.
CaCl is an ionic compound. Calcium is a metal, and chlorine is a non-metal. When combined, a metal and a non-metal form an ionic compound.
Non-metal oxide contains a non-metal chemically combined with oxygen.
Nitrate, NO3- ion, is not an element, so it is useless to classify as (non-)metal. When combined with metal ions it becomes a (soluble) salt.
== It is said that when the two non-metals combine a covalent bond will formed.metal - metal = metallicmetal - nonmetal = ionicnonmetal - nonmetal = covalent ==
No it is ionic because when a metal (sodium) and a non-metal (nitrogen) combine it makes an ionic compound. If you combined two non-metals it would create a molecular compound.
There is no rule about this. Gold is a very stable metal, and neon is a very stable non-metal.
oxygen
The chemists definition of "salt" is: "Any chemical combination of a metal and a non-metal".
Usually a metal bonded and a nonmetal form an ionic bond. There are some exceptions, such as BeCl2, which has covalent bonds.