A chemical element is a chemical substance whose atoms all have the same number of protons. The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus.

118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number , or Z ).

原子序数是一个原子核内质子的数量，也決定元素的性質 [3] 。 拥有同一原子序数的原子属于同一化学元素。 原子序数的符号是z。例如所有的碳原子的原子核都有六個質子，因此碳的原子序数是6 [4] 。 碳原子可能會有不同個數的中子，這些就是碳的同位素 [5] 。. 原子核中質子的個數決定了原 …

A chemical element is a substance that is made up of only one type of atom. [2] Atoms are made up of protons, neutrons, and electrons. The number of protons in an atom is called the atomic number. For example, all atoms with 6 protons are atoms of the chemical element carbon, and all atoms with 92 protons are atoms of the element uranium. The ...

The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.

^1 The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, Thorium, Protactinium, and Uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given.

Below: Examples of certain chemical elements. Frae left tae richt: hydrogen, barium, capper, uranium, bromine, an helium. A chemical element is a speshies o atoms haein the same nummer o protons in thair atomic nuclei (that is, the same atomic nummer, or Z). [1] References

The periodic table is a table that puts all known chemical elements in a specific order. Elements that have similar characteristics are often put near each other. In the table, the elements are placed in the order of their atomic numbers starting with the lowest number of one, hydrogen.

Here's a list of all of the chemical elements of the periodic table ordered by increasing atomic number. Click on the column header to sort the table by that column or click on an element name to get detailed facts about the element.

Échantillons des corps simples, classés selon le tableau périodique.Ceux qui manquent dans le tableau sont trop radioactifs pour être présentés en toute sécurité.. Un élément chimique est une classe d'atomes dont le noyau compte un même nombre de protons.Ce nombre, noté Z, est le numéro atomique de l'élément, qui détermine la configuration électronique des atomes ...