According to one of my favorite sources (www.webmineral.com), the hardness of elemental lead is 2.0 to 2.5 on Mohs Hardness Scale.
As a metal americium is probably hard, but detailed data about his hardness are not published.
Sodium is considered a soft metal. It is malleable and easily cut with a knife.
Lead is a heavy metal that is soft and gray in color, commonly used in pipes, batteries, and roofing materials. Copper is a reddish-brown metal that is known for its excellent conductivity and is used in electrical wiring, plumbing, and as a component in various alloys. Both metals can be toxic in high concentrations, but lead is considered to be more harmful to human health.
Soap can be both hard and soft, depending on the ingredients used in its formulation. Traditional bar soaps are usually hard, while liquid soaps tend to be soft. The hardness of soap is often influenced by the amount of oils and fats in the recipe.
Hard nucleophiles are small, highly charged ions with localized electron density, while soft nucleophiles are larger, less charged ions with more diffuse electron density. Hard nucleophiles prefer to react with electrophiles that are also hard, while soft nucleophiles prefer soft electrophiles. This selectivity is known as the hard and soft acid-base theory. The reactivity of nucleophiles in chemical reactions is influenced by their size, charge, and electron density, with hard nucleophiles typically reacting faster with hard electrophiles, and soft nucleophiles reacting faster with soft electrophiles.
They should use soft lead because I think so!
As a metal americium is probably hard, but detailed data about his hardness are not published.
If you mean the erasers that have a soft side and a hard side, it is because the soft side is designed to erase lead or graphite from a pencil and the hard side is for erasing ink.
Hard
Astronauts should choose pencils with hard lead, as they are less likely to break and create debris in a microgravity environment. Hard lead also provides finer lines, which can be beneficial for precise writing or drawing. Soft lead can smudge more easily and may not perform as well in the vacuum of space. Ultimately, durability and functionality are key considerations for tools used by astronauts.
it is hard and sometimes soft
hard
soft you can bend and hard you can not
"Treated wood can be soft or hard." But, generally what is bought from a lumberyard is soft.
soft
Soft
is larch wood soft or hard wood