Why do atoms have mass and what is the mass of an atom?

Matter is a macroscopic concept, whereas atoms are microscopic concepts.

It cannot be said that atoms make up matter, but that elements make up matter, and atoms make up molecules.

For example, people have mass, so that molecules can be overturned to have mass, so that atoms have mass

Every object has mass, including atoms, of course, atoms can also be split, atoms are composed of atomic nuclei and electrons outside the nucleus, atomic nuclei are composed of neutrons and protons, and protons and neutrons are composed of quarks, which are positive and negative.

In quantum physics, there will be a more detailed explanation.

Because atoms are the basic particles that make up molecules, and molecules are the basic particles that make up substances, because matter has mass, so molecules have mass, and in the same way, because molecules have mass, atoms have mass. Matter is the basic building block that makes up the universe.

Everything has quality.

In fact. Many are artificially defined. You can't get into the nitty-gritty.

Mass is not the amount of atoms an object contains, but the amount of matter.

Mass and atoms also denote different concepts.

Misconception Mass is the amount of matter it contains.

To use an analogy, the quality of rice balls is how much rice is included.

And atoms are like grains of rice.

I think the metaphor on the first floor is good, conceptual problematic, easy to misunderstand, and difficult to explain.

Mass is not the amount of atoms an object contains, but the amount of matter.

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Since the actual mass of atoms is very small, it would be very troublesome to calculate them by their actual mass, for example, the actual mass of a hydrogen atom is kilograms, and the mass of an oxygen atom is kilograms.

The mass of one carbon-12 atom is kilograms. The relative atomic mass of an element is the weighted average of the relative atomic mass of its various isotopes. The lowest number in the periodic table is the relative atomic mass.

The mass of an atom is mainly concentrated in the nucleus.

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Atomic mass, which refers to the mass of the entire neutral atom, is the sum of the mass of the nucleus and the mass of the electron outside the nucleus of the equivalent amount, in the International System of Units.

is measured in kilograms (kg). Atomic mass is divided into absolute atomic mass and relative atomic mass.

Absolute mass refers to the actual mass of 1 atom and can also be called the absolute mass of an atom. Relative atomic mass is the relative mass of an atom, i.e., in the form of a carbon atom.

A carbon atom with 6 protons and 6 neutrons in the nucleus, which can be simply expressed as 12C) one-twelfth of the mass, and the actual mass of other atoms is compared with it, and the resulting value is the relative atomic mass of the atom.

Atomic mass refers to the actual mass of an atom, which is very small and very troublesome if people use their actual mass to calculate, such as a hydrogen atom.

The actual mass is kilograms, which is a value of 26 zeros after the decimal point. Therefore, the relative atomic mass is internationally prescribed.

to denote the atomic mass. A carbon-12 (carbon atom.

There are several, among which there is a carbon atom and its nucleus.

It contains 6 protons and 6 Myolao neutrons, which add up to 12, so it is called carbon-12) The mass of the atom is kilograms. Internationally, it is stipulated that the mass of a carbon-12 atom is divided into 12 equal parts, and the mass of each minute is: kilograms.

The result of comparing the actual mass of some other atom with this number is called the relative atomic mass of that atom.

Such as oxygen atoms. The relative atomic mass of the oxygen atom is about 16, and we use 16 in our calculations.

It's much simpler that way. The relative atomic masses of other atoms are also calculated in the same way. There is a unit relative to the mass of the atom, and its unit is "1", but it is often omitted.

Because the atomic mass value is too small, such as the mass of 1 hydrogen atom and the mass of 1 oxygen atom, it is inconvenient to write and use, so the relative mass is used. Take a carbon atom (this carbon atom is called carbon 12, which is a carbon atom containing 6 protons and 6 neutrons, and its mass 1 12 is equal to 1 12 of the mass as the standard, and the mass of other atoms is compared with it, as the relative atomic mass of this atom. According to this criterion, the relative atomic mass of hydrogen is about 1, and the relative atomic mass of oxygen is about 16.

is the number of protons plus the number of neutrons.

Question 1: What and what determines the relative atomic mass The atomic number is determined by the number of protons, and the relative atomic mass is determined by the sum of the number of protons and the number of neutrons. The chemical properties are determined by the number of electrons outside the nucleus.

Problem 2: What and what determines the relative atomic mass The atomic number is determined by the number of protons, and the relative atomic mass is determined by the sum of the number of protons and the number of neutrons. The chemical properties are determined by the number of electrons outside the nucleus.

Question 3: The main thing that determines the mass of the atom is protons and electrons and the implicit judgment of right or wrong The mass of the atom is mainly concentrated in the nucleus, and the mass of the electron bond shed liquid is very small, almost negligible, and the nucleus is composed of protons and neutrons, so the mass of the atom is determined by protons and neutrons, not the mass of the matter and electrons So the answer is: