In annealed condition, the hardness will be similar to stainless steel.
In anthropology, bronze is regarded as one of the oldest "hard" metals. In chemistry and metallurgy, it is kind of in-between hard and soft. There is not just one metal "bronze". Bronze originally referred to alloys of copper and tin, but today bronze is made with copper in combination with tin, manganese, aluminum, and other materials. Each alloy has its own hardness.
To clean titanium jewelry, you can soak it in warm water with a mild soap and then gently scrub it with a soft-bristled brush. Avoid using harsh chemicals or abrasive cleaners, as they can damage the titanium finish. Alternatively, you can use a jewelry polishing cloth to gently buff the titanium surface.
Gold is soft. You may see in old movies people biting a gold coin--this is because pure gold is soft enough to dent with your teeth, while fake gold is often a harder and more brittle alloy of other metals.
Silver is a relatively soft metal, with a hardness of about 2.5 on the Mohs scale. It is softer than materials like steel or titanium, making it easier to scratch or bend. However, silver can still be durable and is commonly used in jewelry and other decorative items.
The question starts off under the assumption that Titanium is hard which is incorrect. Titanium is not very hard as far as metals are concerned, it has about the same hardness as Stainless Steel. Titanium is not regarded for its hardness but rather its light weight, tensile strength, and non corrosive properties. I believe you may have Titanium confused with Tungsten Carbide which is an extremely hard and heavy metal. Tungsten is generally considered scratch proof; additionally the only naturally occurring element that is harder then Tungsten is Diamond.
Aluminum is not as hard as some other metals, such as steel or titanium. It is relatively soft and lightweight compared to these metals.
Platinum is harder. Gold is a very soft and malleable metal and can be pounded into thin sheets quite easily.
LG does manufacture a hard plastic cover for the LG Xenon. Aside from hard plastic cover, LG also offers a soft silicon cover, a paper cover and a titanium cover.
Hard
Since it is very expensive it is hard to get it...
very hard
hard
it is hard and sometimes soft
soft you can bend and hard you can not
Titanium is used to make gold harder. They often use gold mixed with titanium in jewelry to make it harder.
soft
Soft