The compound is the substance that can be two or more elements that can be changed. Water is a compound. It contains both Hydrogen and oxygen that can stand alone by itself. The mixture is when two different substances that are blended together. The air is a mixture of these elements carbon dioxide, nitrogen, and other stuff. Most mixtures are known to be naturally. The main difference between the compound and the mixture is how they are combined.
In the pure substance, the only way to know if it is an element or compound, is by studying the actually elements and compound that is made from. Elements cannot be broken down into individually pieces. Most elements are in the simplified forms but not in the purified form. The element is the same through the stages of liquid, solid and gaseous states. For example like gold. Gold is gold when it is heated. Gold is gold when it turns liquid. And gold is a single solid element.
The ionic bonds have an attraction between opposite charged ions by one atom, a metal makes a contribution of an electron and becomes a optimistic ion, and when another, a nonmetal received an electron and becomes pessimistic ion. Metal donate electrons and non-metals receives electrons. For example is Na is positive and CL is negative. The covalent bonds share the electrons and they are normally nonpolar. The covalent bonding does not donate or gain electrons such as CH4.
The ionic compounds tend to have eight electrons to keep in the highest energy level. The metals in group one all has one valence electron and in order to have eight and it is easier to lose one valence electron that to try to gain seven valence electrons. Then that electron becomes a noble gas and will satisfy the eight. The elements in table one has one positive charge in their ionic state. The alkaline earth metals which are the group two has two valence electrons and they lose their two and end up as a noble gas and also have an ionic state of two positive...
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