you need
  • - line;
  • - pencil;
  • - Periodic Table.
Take periodic table, with a ruler and draw a line that starts in the cage with the element of Be (beryllium), and ends up in a cell with an element of At (Astatine).
Those that will be left of this line - metals.And the more "below and to the left" is an element - the more pronounced metallic properties it has.It is easy to see that in the periodic table such metal is francium (Fr) - the most active alkali metal.
Accordingly, those elements which are the right of the line, are the properties of non-metals.Here, too, a similar rule is valid: the "above and to the right" of the line item is, the more powerful it is a nonmetal.This element in the periodic table is fluorine (F), strong oxidizing agents.He is so active that chemists previously gave him a re
spectful, albeit informal, nickname: "All the bite."
may arise questions like "But what about those elements that are at the line or very close to it?".Or, for example, "" the right and from the top "of the line are chromium, manganese, vanadium.Is it non-metals?Because they are used in the production of steel as dopants.But we know that even small non-metallic impurities makes the alloy brittle. "The fact that the components on the line itself (e.g., beryllium, aluminum, titanium, germanium, niobium, antimony) are amphoteric, i.e. dual character.
And as, for example, vanadium, chromium, manganese, the properties of their compounds depends on what degree of oxidation are the atoms of these elements.For example, the higher oxides such as V2O5, CrO3, Mn2O7, have strong acidic properties.That is why they are on seemingly "illogical" places in the periodic table.In its "pure" form as these elements are of course metals and possess all the properties of metals.