Chemically, all atoms of the same element are identical in their properties. However, atoms of the same element come in different isotopes, different numbers of particles in the nucleus, and this difference makes for different properties in terms of radiation emission and stability, and to slightly different masses which permit the different isotopes to be separated.
Steel is an alloy, meaning a combination of metals. Stainless steal is a combination of Fe, Cr, C, and Ni.
Surgical steel is Fe, Cr, Ni, and Mo.
Surgical steel wouldn't be the same as Stainless steel, because it would have different elements inside.
Alloys, unlike minerals, do not have a fixed composition. One melt of brass will differ from another. Even within a melt, samples taken early will differ from those taken later.
Element
Valence electrons are very important for the chemical properties of chemical elements; but all electrons have identical sizes.
Steel is more useful than chalk for three reasons that i know of these properties are Strength, Durability, and the strength to hold heavy amounted things sorry if this wasnt what you were looking for... but this is all i got :)
All properties of matter is affected by heat. Only some solid things arent much affected by heat because their molecules are tightly packed and sticked strongly like diamonds and other solid.
All iron or steel (even stainless steel) is ferrous. The word "ferrous" means "iron." All steel contains iron. All steels also contain impurities which improve various useful properties of iron, such as strength. There is high carbon steel, or steel with chromium or other elements that improve abrasion resistance or reduce rusting (stainless steel). There are some non magnetic steels, but because they contain iron they are still ferrous.
The properties of a substance are inherent in that substance, for example steel, but steel can be used to make all sorts of different objects. Each object has its own properties, but the basic property of steel is the same in all of them (for the same grade of steel)
Element
All atoms of one type were identical in mass and properties. (Apex 2021)
All isotopes of a substance are chemically the same. It is their physical properties which are different.
They all have different amounts of protons in the nucleus, different properties, and no two things can be identical.
The number of protons and electrons is identical.
John Dalton
A regular polygon has sides of equal lengths and all angles are identical.
Valence electrons are very important for the chemical properties of chemical elements; but all electrons have identical sizes.
All matter has thermal properties, so yes.
Chemical reactions involve electrons - not protons or neutrons. All isotopes of the same element have an identical number of electrons (just the number of neutrons differs) and hence the chemical properties are identical/very similar.
All atoms of one type were identical in mass and properties. (Apex 2021)