Metals.

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Presentation transcript:

Metals

Why are they so reactive? Alkali metals These are metals in group 1 of the periodic table. They are never found free in nature as they are so reactive. Their activity increases as you go down the group. Why are they so reactive?

Properties of Alkali metals Physical Chemical Soft. Silver in colour. Less dense than water. Very reactive so stored under oil. Form white oxides with oxygen. Form hydroxides with water and also release hydrogen.

Uses of Alkali metals Lithium is used in batteries Sodium is used in street lights. Potassium in compound form is in fertilisers.

Metals and the periodic table Symbols of some common metals Cu = Zn = Al = Fe = Ag = Au = Copper Zinc Aluminium Iron Silver Gold

Corrosion To prevent corrosion: Paint Oil Alloy Galvanise i.e. coat in zinc (gates) Chromium plate (taps)