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.
Element
No, not all steel contains copper and zinc. Steel is primarily made of iron and carbon, with other elements like manganese, nickel, and chromium sometimes added to improve its properties. Copper and zinc are typically not main components in steel production.
simply all particles of one substance are identical means just that. all of the particles that make up a piece of matter are the same. an example of this is water. if you look at water under a microscope, you will see that all of the particles that make up the water are identical.
Dalton's theory mistakenly proposed that atoms were indivisible and that all atoms of a given element were identical in size, mass, and other properties. However, we now know that atoms can be further subdivided into protons, neutrons, and electrons, and that isotopes exist with variations in mass.
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.
All atoms of one type were identical in mass and properties. (Apex 2021)
Element
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 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)
John Dalton
The number of protons and electrons is identical.
A regular polygon has sides of equal lengths and all angles are identical.
All matter has thermal properties, so yes.
They have all the chemical, physical, nuclear properties identical. This is not the case for isotopes.
All atoms of one type were identical in mass and properties. (Apex 2021)
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.