What determines how many atomic compositions a molecule has

The number of atoms of a molecule is determined by the number of electrons in the outer shell of the atom, and each atom has a tendency to keep the number of electrons in the outermost shell tends to be stable, the main group of elements.

Generally, there are 8, and the special case is that the subouter shell of the first few elements with the serial number has only 2 electrons, and the subgroup elements will have other cases, which will not be described too much here. The outermost electrons are less than 4 and volatile electrons, and more than 4 easily available electrons are the basic theory.

Molecular classification can actually be seen in two ways:

One is the compound: there are two kinds of compounds:

Ionic compounds.

The molecular composition of this compound is generally two parts, one part is cationic.

The other part is anion.

The cation loses the outermost electron, the anion gets the extra outermost electron, and then because the charges attract each other, it remains stable, and the cation subouter electrons that lose the outermost electrons reach a stable number, and the anion that gets the electrons also reaches a stable number;

Covalent compounds.

This is not the gain or loss of electrons, but the form of sharing electron pairs, which is equivalent to the electrons of each side, and then each atom plus the electrons of the other can reach a stable state in the outermost shell;

The other molecule is elemental, similar to covalent compounds, which is also a form that shares electrons, but there are also special ones, that is, a single atom forms a molecule, and this form is generally found in elements that are prone to volatile electrons.

Having said all this, I actually want to introduce another term: valence.

The number of electrons that an atom can lose or gain, as a valence, each lost electron is marked with +1 valence (that is, the apparent electrical property), and an electron is recorded with a valence of -1, and the atoms of each element have their own valence, and theoretically multiple atoms can form a molecule as long as the positive and negative valence states can be combined to 0.

The composition of a molecule is determined by the number of elements and atoms that make up the molecule, for example, water, which is made up of one oxygen atom and two hydrogen atoms.

Normally, only rare gas elemental substances (currently only helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (RN) are composed of monoatomic molecules.

It is made up of molecules. For example, the noble gas HE is a basic structure, so molecular crystals are formed under the table, and the van der Waals force is formed between them. Others, such as Si, are not molecular crystals, their formation structure is composed of covalent bonds, so it does not have a molecule, so it is not a monoatomic molecule.

Three-digit, four-modern, 1-fixed, one-number.

Question 1: How many atoms are there in a molecule For example, an H2 molecule contains 2 atoms.

An H2SO4 molecule containing 2+1+4=7 atoms.

An NH3 molecule containing 1+3=4 atoms.

An H2O molecule containing 2+1=3 atoms.

Question 2: How to see how many atoms a molecule in a chemical formula is very simple, the chemical element in each chemical formula indicates which elements the chemical molecule is made of, and the number at the bottom right of the element indicates how many atoms of the element are in each molecule. If there is no number at the bottom right, it means that there is only one atom for that element.

For example, in Hno3, there is 1 H atom, 1 N atom, and 3 O atoms in each Hno3 molecule.

Question 3: What determines how many atoms a molecule has When you learn the chemical structure, you will know that the naming is named after a unit cell, and the substance is composed of an infinite number of unit cells repeatedly. Oh, I'll tell you now, you don't understand.

Question 4: How many atoms are there in a glucose molecule? There are 24 atoms in a molecule.

In one molecule: 6 carbon atoms, 12 hydrogen atoms, 6 oxygen atoms.

A total of 24 atoms.

Question 5: How to distinguish between several atoms and several molecules For example, H2O is made up of 2 H atoms and 1 O atom Two key questions you confuse it. First of all, the individual element symbols, which only represent atoms.

If you add a number after it, it means several atoms. For example, h denotes hydrogen atoms and 2h denotes 2 hydrogen atoms. Secondly, if there is a number in the lower right corner of the element symbol, it means that there are several atoms in one molecule.

For example, H2 means that 1 hydrogen molecule contains 2 hydrogen atoms. Again, having a number in front of the molecule indicates several molecules. For example, 2H2, then the preceding 2 represents 2 hydrogen molecules.

The latter 2 is the same as above.

Question 6: How do you know how many atoms and molecules are in a substance? Hehe, you're a little dizzy, aren't you? It doesn't matter, take your time.

When you think about it for more time, you will suddenly realize, just like when you were in junior high school, you suddenly understood that you didn't know that there were negative numbers in elementary school.

Take a spread of water, for example, these water are made up of many water molecules, and further, water molecules are composed of hydrogen atoms and oxygen atoms in a certain proportion and in a certain arrangement. In general, substances such as water are made up of two elements: oxygen and hydrogen.

If there is salt (sodium chloride) in water, then the crystal structure of sodium chloride no longer exists, and chloride ions and sodium ions will be free between the water molecules, and this solution will have more chloride ions and sodium ions than pure water, and there are also two more elements of chlorine and sodium.

For example, water is made up of water molecules, iron (crystals) is made up of iron atoms, and sodium chloride is made up of two elements, chlorine and sodium, which can also be said to be crystals formed by a certain proportion of chloride ions and sodium ions.

Not necessarily. A molecule is the smallest unit in a substance that is relatively stable and maintains the physicochemical properties of the substance. Molecules are made up of atoms, which are bound together into molecules in a certain order and arrangement through a certain force.

In the case of water molecules, for example, the smallest unit of water is a water molecule composed of two hydrogen atoms and one oxygen atom. A water molecule can be divided into two hydrogen atoms and one oxygen atom by electrolysis or other methods, but the rest of the matter is completely different from water at this time. Some molecules are made up of only one atom, called monoatomic molecules, such as helium and argon, which are both atoms and molecules.

A molecule made up of two atoms is called a diatomic molecule.

The atom is the most basic chemical unit that makes up a molecule, that is, it is the atoms that make up the molecules, not the molecules that make up the atoms.

A reflex is a chemical unit formed by two or more identical or different atoms bonded together by chemical bonds, and has certain stability and independent properties. The atom is a basic substance, composed of protons, neutrons and electrons, and is the most basic unit of a molecule.

Thus, molecules can be seen as being made up of atoms, and not the opposite.

Atomic cavity is the most basic unit of molecules, which are made up of two or more atoms connected by chemical bonds. Thus, it can be said that molecules are made up of atoms, as opposed to holding atoms made up of molecules.

Substances composed of atoms include a few non-metallic elements, such as carbon, silicon, etc., and metallic elements, such as iron, copper, etc. There are also some noble gas elements.

Introduction

Atoms are the smallest particles that cannot be redivided in a chemical reaction. A positive atom contains a dense nucleus and a number of electrons that are negatively charged around the nucleus. Whereas, the nucleus of a negative atom is negatively charged, and the surrounding negative electrons are positively charged.

The nucleus of a positive atom is made up of positively charged protons and electrically neutral neutrons.

The antiproton in the nucleus of the negative atom becomes negatively charged, thus making the nucleus of the negative atom negatively charged. When the number of protons is the same as the number of electrons, the atom is electrically neutral; Otherwise, it is a positive or negative charge of the call calendar.

Depending on the number of protons and neutrons, the type of atom is different: the number of protons determines which element the atom belongs to, while the number of neutrons determines which isotope the atom is of that element. Atoms make up molecules, and the same kind of charges in the molecular composition and search matter repel each other, and different kinds of charges attract each other.

In general, common substances directly composed of atoms are: metals, noble gases.

For some solid non-metals such as C and Si, the most intuitive way to judge whether a substance is directly composed of atoms is to see if the periodic table can be used.

in the single element symbol.

The substance that can be directly represented by the symbol of the element is directly composed of atoms, and vice versa. That is, the matter directly composed of atoms must be elemental, and the chemical formula has no subscript number, only element symbols. (P and S are not directly constituted by atoms, because they both have the smallest rejuvenating complex unit, the real chemical formula of P is P4, and P4 is the smallest repeating unit of P, that is, P is composed of countless P4 molecules, so P is made up of molecules.)

The junior high school abbreviation, and the real chemical formula of s is S2, S4, S8, etc.);

Common molecular composition: as long as there are no metallic elements in the chemical formula.

Anything that does not contain NH4+ can be considered to be made up of molecules. For example, all gases, all organic matter, all acids, H2O, I2, Br2, etc.

Special case: Although AlCl3 contains metal elements, AlCl is composed of Al2Cl6 molecules (two AlCl molecules polymerized into dimeric Al2Cl6).

No. A molecule is the smallest particle that maintains the chemical properties of a substance. Molecules are made up of atoms; Atoms are the smallest particles in chemical change. In chemical changes, molecules can be divided into smaller particles --- atoms, and atoms can no longer be divided.

When a substance changes physically, only the intermolecular intervals change, but the molecules themselves do not change; When a chemical change occurs, the molecule is destroyed and the molecule itself changes.

In all chemical reactions, the type of element, the type of atom, the number of atoms, and the mass of atoms remain unchanged before and after the reaction.

How atoms make up molecules 3 minutes to take you through abstract atomic bonds.