metallic & non metallic character
Answers
The tendency of an element to loose electrons and form positive ions called cations is called electropositive or metallic character.For Eg: Alkali metals are more metallic.
The tendency of an element to gain electron and form negative ions called anions is called electronegative or non- metallic character.
Metallic Character of a Metal
Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Within a compound, metal atoms have a relatively low attraction for electrons. This is indicated by their low electronegativities.
By following the trend summary in the figure below, you can see that the most reactive metals would reside in the lower left portion of the periodic table. The most reactive metal is caesium, which is not found in nature as a free element. It reacts explosively with water and ignites spontaneously in air.
Non-metallic Character of a Metal
Nonmetals tend to gain electrons in chemical reactions and have a high attraction for electrons within a compound. The most reactive nonmetals reside in the upper right portion of the periodic table. The noble gases are a special group because of their lack of reactivity. However, the element fluorine is the most reactive nonmetal. It is not found in nature as a free element.
Fluorine gas reacts explosively with many other elements and compounds and is considered to be one of the most dangerous known substances.
Note that there is no clear division between metallic and non-metallic character. As we move across the periodic table, there is an increasing tendency to accept electrons (non-metallic) and a decrease in the possibility that an atom would give up one or more electrons(metallic).
Francium is below caesium in the alkali metal group. However, it is so rare that most of its properties have never been observed.
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