This article is about Aktinum. The Actinum is a typical metal.All minerals are soft and silver (but are discolored in the air).Some can cut with a knife.The resistance is µOHM · cm between 15 and 150.The hardness of thorium is similar to soft steel.Strongly heated thorium can be rolled like paper or can be made of wire.Thorium is about half of uranium and plutonium.But it is harder than uranium and plutonium.All Actiniums are radioactive elements, they have a box, and in an unusual case, they have multiple crystals.There are seven plutoniums, and three uranium, nepunium and three Californium.The crystalline structure of protelklinum, uranium, nepunium, and plutonium is not similar to the Lantanum, and has a 3D form, similar to metal metal.
What is similar to the hardness of thorium?
Soft steel