The reason why metal have to be clean with sandpaper is to remove the oxide layer on the surface of the metal. This is because most metal have a high tendency toward oxygen. The metal will react with oxygen in the air and form an oxide layer on the surface of the metal.
To avoid rusting
Fine sawdust occurs when wood is sandpapered.
what are the characteristics of metals? metals? non-metals?
metals
Metals, non metals and metaloids (which have some of the properties of both metals and non metals).
They are in between the metals and non metals
Alkali metals are very reactive metals.
You can see the Alkaline Metals, Alkaline Earth Metals, Transition Metals, Other Metals (poor conducting metals), metaloids (characteristics of metals and non-metals combined), non-metals, noble gases, and unknown metals (like #112-118)The transition metals at the bottom of the periodic table are lanthanides and actinides.3 main ones are usually: Alkaline metals, Transition metals, and Non-metals...I hope this was useful!-Fuyuki
The three main metals in a periodic table are transition metals, alkali metals, and alakaline earth metals.
metals
metals
They are Metals