The particles that maintain the chemical properties of iron are A iron element B iron ion C iron ato

Hehe, in fact, D is also okay, I think. Because iron is a metal, it is a monoatomic molecule, and a so-called iron molecule is actually an iron atom, so this is called the best of the best, although the statement d cannot be wrong, but c is better than d.

C, iron is not made of molecules, it is made of atoms. At this point it is the atom that retains its chemical properties.

First of all, there is no such thing as an iron molecule, which is made up of metal ions and freely moving electrons.

Second, that sentence is established on the premise that matter is made up of molecules;

Third, the properties of an atom are determined by the number of electrons in its outermost shell, so it is not the second.

Iron is not a particle of the kind, it is a collective term for all iron atoms and iron ions, so it is not.

Because iron is directly constituted by atoms.

In fact, the sentence in the book is not comprehensive, and our teacher has already corrected it in the third year of junior high school.

The particles that maintain the chemical properties of the substance have molecules, atoms, ions and you have to look at what the substance is made of to infer it.

Generally, substances composed of non-metallic and non-metallic elements are made up of molecules.

Substances composed of metallic and non-metallic elements are made up of ions.

Metals and carbon elements are made up of atoms.

c, Iron is made up of atoms.

Metallic elements, most solid non-metallic elements, and rare gases are composed of atoms; Gases are non-metallic elements that are made up of molecules.

Iron is a metal and is directly composed of iron atoms, and the smallest particles that maintain the chemical properties of iron are iron atoms.

Iron (ferrum) is a metallic element, the atomic order is 26, iron elemental chemical formula: Fe, English name: iron.

The average relative atomic mass is. Pure iron is white or silvery-white with a metallic luster. Melting point 1538, boiling point 2750, soluble in strong acid and medium strong acid, insoluble in water.

Iron has 0, +2, +3, +4, +5 and +6 valences, of which +2 and +3 are more common, and +4, +5 and +6 are rare.

Iron is widely distributed in life, and the content of the earth's crust is second only to oxygen, silicon, and aluminum, ranking fourth in the earth's crust. Pure iron is a flexible and malleable silvery-white metal, used to make the core of generators and motors, iron and its compounds are also used to make magnets, drugs, inks, pigments, abrasives, etc., is one of the "ferrous metals" in the industry.

Chemical reactions of iron:

Iron is a relatively reactive metal, ranking ahead of hydrogen in the metal activity sequence table, with relatively active chemical properties, and is a good reducing agent. Iron does not burn in air, but it can burn violently in oxygen.

Iron is a valence element, 0 valence is only reducing, +6 valence is only oxidizing, +2, +3 valence is both reducing and oxidizing.

At room temperature, iron is not easy to react with non-metallic elements such as oxygen, sulfur and chlorine in dry air, and if there are impurities, it is easy to rust in humid air; Rust is faster in moist air in the presence of a solution of acids, alkalis, or salts.

At high temperatures, there are violent reactions, such as iron burning in oxygen to form Fe3O4, and red-hot iron and water vapor to react to form Fe3O4. When heated, it can be combined with halogen, sulfur, silicon, carbon, phosphorus, etc. In addition to the +2 and +3 valence oxides, the complex oxide Fe3O4 (the main component of magnets) is generated.

Answer: An iron molecule is a monoatomic molecule, i.e., an iron atom is an iron molecule.

Matter is made up of molecules, and molecules are made up of atoms. Some substance molecules are made up of multiple atoms and are called polyatomic molecules, such as O, CO, DNA molecules.

Wait. Some substances are a molecule with one atom, such as Fe, Cu, Ag, etc.

Molecules are the ones that maintain the chemical properties of the substance.

The smallest particles that do not change. To be precise, iron molecules are the smallest particles that maintain the chemical properties of iron. And an iron molecule is an atom of iron, and the description in the problem is also acceptable.

That's not the case, is it? When talking about chemical properties, there is no such thing as "the chemical properties of iron", either the chemical properties of iron atoms, or the chemical properties of divalent iron ions or trivalent iron ions.

Iron is a metal and is made up of atoms, as detailed in the chemical structure of the third chemical.

The smallest particles are selected to maintain the materialized nature of Fe2O3 in the bond grinding band.

D is the smallest particle that retains the chemical properties of Fe3O4.

A denotes 2 iron atoms.

1. Iron is composed of iron atoms.

2. Iron is widely distributed in life, and the content of the earth's crust is second only to oxygen, silicon and aluminum, ranking fourth in the earth's crust. Pure iron is a flexible and malleable silvery-white metal, which is used to make the iron core of generators and motors, and iron and its compounds are also used to make magnets, drugs, inks, pigments, abrasives, etc. In addition, the human body also contains iron, and +2-valent ferrous iron is an important component of hemoglobin, which is used for oxygen as much as a transfusion.

No, 1, concept.

An element is a general term for the same class of atoms with the same number of nuclear charges.

Atoms are the smallest particles in chemical change.

2. Differences. The element focuses on the type and does not indicate the number of numbers, and does not mean the number of quantities; Atoms represent both types and numbers, and have the meaning of quantity.

3. Field of use.

Elements are used to describe the macroscopic composition (traditionally speaking) of matter, such as: water contains hydrogen and oxygen, and water is composed of hydrogen and oxygen. But it cannot be said that "water is made up of two elements of hydrogen and one element of oxygen".

Atoms are used to describe the microscopic composition (conventionally speaking) of matter, for example, a water molecule is made up of two hydrogen atoms and one oxygen atom. But it cannot be said that "a water molecule is made up of hydrogen and oxygen." ”

4. Contact. An element is a general term for the same class of atoms; Atoms are the basic units that make up an element.

Do you understand that?