How to judge the period of an element according to the electron configuration of the valence shell?

How to according to the valence electrons.

Arrangement determines whether the element is in the primary or secondary family.

Generally speaking, the inner shell electrons of the main group elements are saturated (with the exception of empty orbital filling lag), and the outermost shell only has s and p sublayer orbital filled electrons that do not undergo energy level interlacing, so just look at the outermost valence electron configuration, and those that do not involve d and f sublayer orbitals are all main group elements, with only a few exceptions: noble gases.

Not belonging to the main group, palladium is the outermost part of 4d10 electrons configuration equal to the outermost shell with eighteen electrons etc. The inner electrons of the subgroup and group 8 elements are mostly unsaturated (with the exception of copper, zinc, palladium, etc.), and the outermost valence electron configurations involve d and f sublayer orbital electrons.

According to valence shell electrons.

The characteristics of the configuration can be placed on the periodic table.

The elements in are divided into 5 regions, which is actually to concentrate elements with similar configurations of valence shell electrons in one region: S block elements: the last 1 electron is filled in the ns orbital, and the configuration of the valence shell electrons is ns1 or ns2, which is located on the left side of the periodic table, including a and a groups, which are both reactive metals that are prone to losing electrons to form 1 or 2 valence ions.

For the main group elements in the process of electronic arrangement, the number of electrons in the outermost shell is equal to the number of groups, the number of electrons in the outer shell is equal to the number of periods, and the number of electrons in the outer shell is less than 2 is the s-region, and greater than 2 is the p-region.

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Columns 3 to 12 are transition metal elements, so d is correct.

First, the price of electricity is absolutely basic.

Valence electron beam defeat refers to the energy of electrons outside the nucleus to interact with other atoms to form chemical bonds.

Valency with elements.

about electronics.

Second, the valence electron shell.

The energy level at which the valence electrons are located is called the valence electron shell. Valence shell electrons.

It refers to the electrons outside the nucleus that can interact with other atoms to form chemical bonds, and are related to the valence of the element, also known as valence electrons.

English explanation: valence-shell electron pair repulsion theory is the outermost electron for the main group element. For the subgroup elements, part of the electrons of the subouter shell are also included.

The outermost electron is a schematic diagram of the atomic structure.

, the outermost layer of electrons.

Example: Fe atom.

The peripheral electron configuration is 3d64s2, the number of peripheral electrons is 8, the valence electron configuration is 3d64s2, the number of valence electrons is 8, and the outermost electron number is the number of electrons n=4, and there are only 2 electrons of 4s2.

a There are 18 vertical rows in the periodic table of Yuan Qingyun, but it contains 7 major families, 7 minor families, 1 zero family, and 1 first group, with a total of 16 families, so A is wrong;

The B ia group contains alkali metals and hydrogen elements, and other elements other than hydrogen belong to alkali metals, so B is wrong;

c The number of electrons in the normal combustion outer shell of C He and Mg is 2, which does not belong to the same family, so C is wrong;

d Columns 3 to 12 are transition metal elements, so d is correct so d is selected