In geometry, a heptagon is a seven-sided polygon or 7-gon. The heptagon is sometimes referred to as the septagon, using “sept-” (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix; both are cognate) together with the Greek suffix “-agon” meaning angle.

Of all the metals, tungsten reigns supreme in terms of tensile strength. titanium is the strongest and mercury is the weakest. Tungsten | The Strongest Metal on Earth. Osmium belongs to the platinum group metals and displays a high density.

Titanium is not stronger than a diamond. In terms of hardness, Titanium is not harder than a diamond either. Diamond strength is around 60 GPa. As for the hardness scale, titanium is 36 Rockwell C, while diamond is 98.07 Rockwell C.

Tungsten measures between 8 and 9 on the Mohs hardness scale. (Diamonds are a 10 – the highest.) Due to their extreme hardness, Tungsten Rings will hold their shape and shine longer than any ring on the market.

Gold has many more protons and neutrons in the nucleus of each atom than iron does. So each gold atom weighs almost four times as much as each iron atom. So gold ends up denser. There’s a general trend that the volumes of the heavy atoms don’t go up as fast as the weights do, so they tend to form denser materials.

The problem with making good-quality fake gold is that gold is remarkably dense. It’s almost twice the density of lead, and two-and-a-half times more dense than steel. A bar of steel the same size would weigh only thirteen and a half pounds.

No doubt, gold is a beautiful and popular precious metal. But it’s also soft and tends to scratch easily. Now a research team from the EPFL in Switzerland, with support from Swiss watchmaker Hublot, have created a very hard high-quality gold. …

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Most studies agree gold is overall the more rare of the two metals; however, above ground silver is actually more rare than gold. To date, over 1.5 million tonnes of silver have been mined.