Is a substance composed of isotopes considered pure 20?

The definition of isotope is different atoms of the same element, so it is composed of the same element, while the definition of pure matter is that it contains only one substance, for example, deuterium and deuterium are both elemental substances composed of different atoms of the hydrogen element but they are not the same kind of substance (the same substance refers to 2 or more substances with the same physical properties, chemical properties and radioactivity), and the physical properties of isotopes (such as density) are generally different, the chemical properties are basically the same, the radioactivity is often completely different, and naturally acid is the same substance, It can't be considered pure. I don't know if you can understand that.

Isotope words, count!

Because. 1.First of all, there is no guarantee that the atoms in many objects are of the same species, and there are some isotopes.

2.Pure things should be had.

The same material composition - not discussed for now.

There is a fixed composition - this can correspond.

Can be expressed in a chemical formula – yes.

There are certain physical and chemical properties - the influence of isotopes on physical properties is negligible, and there seems to be no effect on chemical properties (because there is no effect on electrons outside the nucleus).

So, I don't need to say it! Pick me.

All elements that have isotopes are present in any substance it forms without special separation. Therefore, the distinction between isotopes is not considered to determine whether a substance is pure or not. If the water contains heavy water, it is still considered pure.

But just because we are considered pure doesn't mean we can't distinguish between them. It can be seen that this is only a question of the meaning of the concept of pure matter, and it is important to know that this pure substance has characteristics that are different from ordinary pure substances!

Be sure to read the last sentence)

Not necessarily. Definition of pure substance: A substance composed of the same element or compound is called a pure substance, and a mixture is defined as a substance composed of two or more pure substances.

Definition of isotope: Nuclides with the same number of nuclear charges and different numbers of neutrons belong to the same element, occupy the same position in the periodic table, and are called isotopes to each other.

Substances composed of elemental isotopes are not necessarily pure, such as H2 containing D2 and H2O containing D2O, in fact, their chemical properties are different, and they can be regarded as mixtures.

However, they are generally considered to be pure because they are made up of molecules of the same substance.

Different isotope chemistries are exactly the same as each other" is false.

Definition of pure substance: The substance composed of the same kind of molecule is called pure substance, the definition of the mixture is composed of two or more pure substances, the substance composed of isotopes is not necessarily pure substance, you have to see that it is composed of several compounds, taking h as an example, water and heavy water are mixed with pure substance, but water and h2o2 (h2o2, h is heavy hydrogen), which is a mixture.

As long as the substance can write its chemical formula (it cannot be the main component), it is pure.

For example, a cl35 and a cl37 can form cl2, but the chemical formula becomes 35cl37cl.

Calculate. Because the elements are the same. Atoms are the smallest particles in chemical change.

The isotope series atoms, although different, are also chemically judged to be pure. Because different isotope chemistries are exactly the same as each other.

It doesn't matter because there is no definitive definition yet.

Just like 0 was not called a natural number a few years ago, but now it is redefined and counted as a natural number.

Actually, these things don't have any practical significance.

According to the concept of pure matter, don't think that there are isotopes that exclude matter from pure matter, okay?

It must be counted in middle school textbooks.

Not necessarily in college textbooks

Because an isotope is a group of nuclides with the same atomic number but different masses, i.e. different neutron numbers.

Because it has the same electronic structure, it has similar macroscopic chemical and biological properties, occupies the same place in the periodic table of chemical elements, and is regarded as a substance. Therefore, even if they are mixed together, they are still treated as one substance. Isotopes are divided into two main categories:

Radioisotopes and stable isotopes. Radioisotopes are known to everyone, stable isotopes include hydrogen, oxygen, carbon, nitrogen, etc., and there must be isotopes where the atomic weight is a decimal. That is, there are isotopes everywhere in life.

Isotopes: atoms with the same number of protons and different numbers of neutrons are called isotopes to each other;

Elemental: a substance composed of the same element;

Compounds: substances composed of a variety of elements;

Mixture: A substance in which a variety of substances are mixed together;

Pure substance: a substance composed of only one molecular structure;

Charged atoms are ions;

Magnets are chemical compounds; fe3o4；