Because gold is found naturally
Yes, it is. It is better than aluminum, but not as good as copper. Aluminum is often used in heat sinks, though, because it is cheaper than gold or copper.
Aluminum is slightly harder than gold. In a way yes and in a way NO. It depends on the purity and the age of both metals. Pure gold - 24 carats is far softer than aluminum or aluminium, whereas 9 carat gold which is an alloy of gold and other metals may be harder. You also need to consider what happens to aluminum when it is exposed to the air and over time will deteriorate as it is chemically corroded and ages. It softens and loses its strength. Gold does not corrode, it does not deteriorate - it is classed as a noble metal. So long term gold is stronger, harder than aluminum. Aluminum is used in overhead power lines, airplanes etc., gold would be more efficient at transmitting electricity, but it would be useless to construct an airplane.
Aluminum was more expensive than gold when first discovered because it was difficult to extract pure aluminum from its ore using available technology at the time. This made the process of producing aluminum costly compared to gold. However, with advancements in technology, aluminum became easier and cheaper to produce, leading to a decrease in its cost over time.
Compared to what? It's cheaper than steel, or aluminum, and so far it's cheaper than plastic.
Silver is, then copper, then gold, and then aluminum. Copper is used for wiring because it is cheaper than silver. Aluminum is not used very much anymore because it can be dangerous when installed improperly.
No, gold is much more dense that aluminum.
Yes, aluminum is more reactive than gold. Aluminum is more prone to oxidation and reacts readily with oxygen in the air, whereas gold is a noble metal and does not easily react with other elements.
Aluminum has a lower density than gold, meaning the same mass of aluminum takes up more space compared to gold. Therefore, a kilogram of aluminum will occupy more volume than a kilogram of gold due to the difference in their densities.
No, gold is around twice more expensive than iridium.
Gold is a relatively good thermal conductor, but not as high as materials like copper or silver. It has a thermal conductivity of about 320 W/mK, which means it can effectively transfer heat but is not the most efficient material for this purpose.
Gold has a higher density than aluminum. The density of gold is approximately 19.3 grams per cubic centimeter, while aluminum has a density of about 2.7 grams per cubic centimeter. This significant difference means that gold is much heavier than aluminum for the same volume.
aluminum is the lightest atomic #13 titanium atomic #22 silver atomic #47 gold is heaviest atomic #79