107 Stories About Chemistry
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Why should they accept electrons in their outer shell when forming compounds if they have only two electrons in it? It is much easter for them to give away these two electrons to the elements they react with. Besides, they do not object to borrowing additional electrons from their incomplete second-last shell. As a result, they can display various positive valences. For instance, manganese may be positively di-, tri-, tetra-, hexa-, and even heptavalent. The same is observed in the subsequent periods of the Periodic Table. That is why there are so many metals and why they are more like one another than the nonmetals.
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