Periodic tableis a table that organizes chemical elements within the framework of certain rules. For years many scientists have been working on ordering the elements, but Dmitri Mendeleev He is known as the person who prepared the first version of the periodic table. Since then, the features of the periodic table have undergone several changes in light of developments in chemistry and physics.

Today, of 118 elements The periodic table on which it resides is considered one of the most significant achievements in the history of science, with the information it contains and the conveniences it provides. Today, it has been a roadmap for many scientists for many years, making it easier for us to understand the material world. periodic table We discussed all the details about it.

First, what is the periodic table?

The chemical elements often referred to as the periodic table periodic table, lists all chemical elements in ascending order of atomic numbers. Scientists use the periodic table to more quickly get information about elements, such as atomic masses and chemical symbols. In addition, the order of the periodic table makes it easy to discern the details of many element properties, including electronegativity, ionization energy, and atomic radius.

Many scientists have conducted various studies to arrange the elements in an orderly manner. However, Dmitry Mendeleev in 1869 He introduced the first version of the periodic table. Since then, the periodic table has evolved in the light of scientific progress.

So what are the features of the periodic table?

• Today it consists of 118 elements.
• As you go from left to right, the atomic number and mass number increase.
• As you move down from the top, the atomic number and metallic character increase.
• The first version of the periodic table had only 63 elements
• Elements in the same group have similar properties

153 years The periodic table, which has a history, contains numerous features. organized according to certain rules periodic tableprovides information about many properties of elements. According to the first version, prepared by Mendeleev in 1869, it has undergone many changes.

Interesting information about the periodic table:

• There are only 94 naturally occurring elements in the periodic table.
• Technetium is the first artificial element in the ruler
• The ruler is under constant review by IUPAC
• The modern periodic table is arranged by ascending atomic number.
• The atomic size decreases as the atomic number in the periodic table increases
• Mendeleev correctly predicted the existence of yet undiscovered elements
• The atomic mass in the periodic table is the weighted average of all isotopes of the element.
• The periodic table is modeled after a deck of cards.

There are only 94 naturally occurring elements in the periodic table.

Only elements in the periodic table 94 of themare elements found in nature. All other elements are man-made. Some sources state that more elements are formed naturally, as heavy elements are known to switch between elements when exposed to radioactive decay.

Technetium is the first artificial element in the ruler

technetiumin Italy in 1937 Emilio Segre It is an element discovered by The element with the atomic number 43 is an artificially produced one is the first component. It has an atomic number of 43 and all isotopes are radioactive.

The ruler is under constant review by IUPAC

The International Union of Fundamental and Applied Chemistry (IUPAC), as new developments in chemistry take place and new data become available. review the periodic table do.

The modern periodic table is arranged by ascending atomic number.

Mendeleev’s first periodic table The main difference between the modern periodic table and Mendeleev’s elements to atomic mass while the modern periodic table is arranged according to the elements to atomic number regulate accordingly. For example, hydrogen, the first element in the periodic table, has a proton and an electron. The second element, Helium, has two protons and two electrons. Each successive element has an extra proton and electron over the previous element.

The atomic size decreases as the atomic number in the periodic table increases

The atomic size of an element is expected to increase as the atomic number of its atoms increases, but this is not always the case. The size of an atom is determined by the diameter of its electronic shell. Therefore, as the element moves from left to right along a row, size of atoms usually shrinks.

Mendeleev correctly predicted the existence of yet undiscovered elements

Dmitri Mendeleev, is the scientist who prepared the periodic table in the way that most resembles today’s periodic table. By arranging the elements according to their atomic masses, he discovered patterns of repeating properties and grouped these elements together. When Mendeleev completed the first version of the periodic table, there were many elements and spaces still to be discovered. Accurately identify these missing elements with various analyses. councils passed.

The atomic mass in the periodic table is the weighted average of all isotopes of the element

IsotopesAtoms with the same number of protons but different number of neutrons. Since the mass of an atom comes from its protons and neutrons, if the number of neutrons is different, each atomic mass of the isotope it will be different. So the atomic masses you see on the periodic table are actually the weighted average of all isotope masses.

The periodic table is modeled after a deck of cards.

Known for his love of card games Mendeleev, He took these games as an example when drawing up the periodic table. He wrote the weight of each element on a separate card and put them all on what we know. patience sorted in the style of the game.