Talk:Metal

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I don't want to start an edit war, but some of the alkali metals can be cut with a knife, which means they are soft. The reason why usually high melting-points is necessary is mercury, rubidium, gallium, and cesium are all liquid at or near room temperature. While the concept of high MP or low MP differs, everyone on the planet would agree that these are low in comparison to the melting points of other metals (eg. tungsten). Mercury's melting point is below 0C. All people would agree that that is low.

What metal oxides are basic? Most metal oxides are completely inert. Al2O3, SiO2, TiO, etc. Metal hydroxides are basic (NaOH, KOH), sure, but that's an entirely different animal.

Eric 22:34, 29 Jan 2005 (UTC)

I just want to add a little more about acidic/basic properties of metal oxides. Some metal oxides in their highest oxidation state are far not inert being extremely aggressive oxidizers (dangerous in handling!) and definitely acidic because they produce pH < 7 when mixed with water (or willingly soluble in alkali) e. g., CrO3, MoO3, WO3, V2O5, Mn2O7 unlike those of low oxidation state, which are neutral or even somewhat basic like TiO and PbO soluble in sulfuric acid. From another hand, TiO2 and Pb3O4 are soluble in molten NaOH. Thus, yes, basicity/acidity conception is hardly helpful for definition of what metals are, though nevertheless, it is true: most of metal oxides in their low oxidation states are basic or amphoteric. In general, the higher group number of an element in Periodic Table the less basic is the corresponding oxide. {Nick Moskalev, September 25, 2005}

[edit] metal forming

How is metal processed in a way to punch a hole and then thread it, with hole boed in the direction of how the hole was made?