The concept of Elemental Elemental Elemental Elemental Elemental Elemental Element

1. In many chemical reactions, participating in the reaction as a whole, such a group of atoms is called an atomic group. Atomic clusters cannot make up matter on their own;

2. Elements, also known as chemical elements, are a general term for atoms with the same number of nuclear charges. Such as hydrogen, carbon, sulfur, iron, etc. are all elements. Regardless of whether they exist in the form of elemental or compound matter, their nuclear charge number is etc.

According to the different main properties, it can be divided into three categories: metal elements, semi-metal elements and non-metallic oxygen elements. But sometimes it is difficult to divide the elements, and some of the elements are artificially made radioactive elements.

3. Elemental: a pure substance composed of an elemental atom. Such as hydrogen, oxygen, etc.

Elemental matter and element are two different concepts. Elemental matter is the concrete form in which an element exists in its free state. An element is the collective name of the same kind of atom, and an element may have several elemental elements like the oxygen element, which has two elements, oxygen and ozone.

4. A pure substance composed of atoms of different elements. Such as water, carbon dioxide, potassium chlorate, potassium permanganate, etc.

Atomic clusters: In many chemical reactions, groups of atoms that participate in the reaction as a whole are called clusters. Carbonate: CO3 -2 valence Sulfate: SO4 -2 valence Hydroxide: OH -1 valence.

For the rest, take iron as an example.

fe represents the symbol of this element, which is an abstract classification without substance; Fe atoms, which are the constituent units of iron, are equivalent to small balls; Iron elementality, which means that this piece of iron is only composed of iron atoms, and is not mixed with rust or the like, nor is it a compound such as iron oxide.

There are quite a few, and it's not easy to generalize.

Elemental metals, elemental gases, and carbon (graphite, diamond), phosphorus.

It is broadly divided into: 1 Elemental metal (all metallic substances).

2 Noble gas elemental (i.e., monoatomic molecules: helium, neon, argon, krypton, xenon, radon, of which radon is radioactive).

3. Atomic crystals (substances connected by covalent bonds, that is, common electron pairs between atoms, such as graphite, diamonds, crystalline silicon, silicon dioxide, aluminum chloride, etc., such substances do not have the so-called smallest particles that maintain chemical properties, that is, there is no real molecular formula, and some are only the simplest integer ratios between different atoms, except for elemental matter, of course, that is, for this kind of substance, you can understand it as a single molecule whose size can change arbitrarily, and their atomic numbers can change arbitrarily, but the proportion remains the same).

It should be pointed out that all elemental substances are directly composed of atoms (except for a mixture composed of one atom, such as a mixture composed of oxygen and ozone is not elemental) In addition, all atomic crystals, whether they are elemental or compounds, are directly composed of atoms, which is determined by their own characteristics, and I am not wrong to list aluminum chloride as a covalent compound above, because aluminum is an amphoteric metal and can show certain non-metallic properties. But not all covalent compounds are atomic crystals

A substance that is directly composed of atoms, strictly speaking, only atomic crystals are substances that are directly composed of atoms.

Like diamond, crystalline silicon, crystal (silicon dioxide), emery (silicon carbide), silicon nitride ceramics, etc.

Elemental metals are not substances that are directly constituted by atoms. Metal crystals are made up of metal cations and free electrons.

Noble gases: are molecular crystals. Of course, rare gases have special characteristics, and one of its molecules is an atom, so it can barely be touched. But it's best not to count it as a substance made of atoms.

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.

Elemental: A pure substance composed of one element.

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;

Elemental means that the substance is pure.

Matter is made up of elements and is made up of atoms or molecules. An element is a general term for a class of atoms that have the same number of nuclear charges, i.e., the number of protons in the nucleus. In chemical change, molecules can be redivided, but atoms cannot be redivided.

Mixture: Consists of two or more substances.

Pure: Consists of a substance.

Compounds: Pure substances composed of two or more elementsElemental substances: Pure substances composed of one element.

In the question, first of all, it is necessary to distinguish whether it is a mixture or a pure substance, if it is a mixture there is nothing to say, if it is a pure substance, then distinguish whether it is a compound or an element.

The difference between a mixture and a pure substance is that it is made up of several substances; Compounds and elementals are pure substances, and they are distinguished by the fact that they are composed of several elements.

Elemental matter can be composed of different atoms, as long as the two atoms belong to the same element, such as deuterium, it can also be called hydrogen molecule, and the hydrogen molecule itself is composed of three isotopes randomly combined.

Metals also have isotopes, and several atoms of the isotope can still make up pure metals.

Non-metals can, such as water, consist of hydrogen atoms and oxygen atoms.

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(Note: The numbers in all of the following chemical formulas are subscripts, i.e., the number of atoms in a molecule) 1 valence: NO3 nitrate OH hydroxide CLO3 chlorate HCO3 bicarbonate MNO4 permanganate 2 valence:

CO3 carbonate SO4 sulfate MNO4 manganate 3 valence: PO4 phosphate.

1 valence: NH4 ammonia.

Actually, ......In layman's terms, people go to high places and water flows to low places. Material existence will go to the most stable state. Ions can exist, but due to their electrical nature, they are like a magnet that attracts objects around them.

There are many ions, and when they are in water, they will wrap some counter-charged ions and some polar molecules around them under the action of attraction to form an ion cluster. (It is often the big ones that attract the small ones, and the metal ions are generally larger, hahaha.) And this ion cluster will be much more stable relative to the outside world.

2.This ......Still a matter of stability. SO4(2-) is not formed randomly, and when they are formed, someone will inevitably take those two electrons away, because they have no place to live, and they are also very unstable.

You probably haven't learned tracks, so ......Not to mention) the state of electrons leaving directly is actually very unstable, and it generally does not happen. This electron has to be a strong electron on the side and run away with them, eh, so the general substance doesn't have only anions or cations alone.

Ions cannot exist in a single form, the ion should exist in the solution, for example, NaCl solution, there are sodium ions, chloride ions, in the solution, there will be no separate sodium ions

1.No, the matter itself is equilibrium and both anions and cations have an electric charge and are extraordinarily electrically unbalanced.

2. The atomic cluster is equivalent to a whole, and it was treated as an ion in junior high school.

For example, if you want to use the valency of SO4(2-), S:+6 valence, O:+2 valence 4, then the whole SO4 is (+6)+(2) 4=-2, so the whole atomic cluster is -2 valence.

Ions in the liquid state can.

The definition of an atomic cluster is specific to the reaction process.

In junior high school, these are very shallow, and you should not be entangled in these.

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.

Elemental: A pure substance composed of one element.

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;

Elemental means that the substance is pure.

a. It contains a molecule, and the molecule is composed of the same kind of atom, so the diagram represents the elemental substance in the pure substance;

b. The diagram shows that there is an identical molecule, which is composed of two different atoms, which represents a compound in a pure matter;

c. The diagram contains two molecules, which are mixtures;

d. Contains two molecules, indicating a mixture;

So the answer is: a