Search results
Transcript. Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴. Created by Sal Khan.
- 5 min
- Sal Khan
Overview. Electron configuration. The number of valence electrons. Valence shell. Chemical reactions. Electrical conductivity. References. External links. Valence electron. Four covalent bonds. Carbon has four valence electrons and here a valence of four. Each hydrogen atom has one valence electron and is univalent.
In the case of Boron, the abbreviated electron configuration is [He] 2s 2 2p 1, so the number of valence electrons is 1 (2s 2 2p 1) In the case of Iron, the abbreviated electron configuration is [Ar] 4s 2 3d 6 , so the number of valence electrons is 8 (4s 2 3d 6 )
Feb 19, 2022 · As we go across a period from left to right, we add a proton to the nucleus and an electron to the valence shell with each successive element. As we go down the elements in a group, the number of electrons in the valence shell remains constant, but the principal quantum number increases by one each time.
Jul 20, 2022 · Valence shell electrons (or, more simply, the valence electrons) are the electrons in the highest-numbered shell, or valence shell, while core electrons are the electrons in lower-numbered shells. We can see from the electron configuration of a carbon atom—1s 2 2s 2 2p 2 —that it has 4 valence electrons (2s 2 2p 2) and 2 core electrons (1s ...
The configuration is determined by applying the rules of the Aufbau Principle. Valency and Valence Electrons The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons. Valence electrons are the highest energy electrons in an atom and are therefore the most reactive.
Mar 3, 2021 · Carbon’s ground state electron configuration is 1s 2 2s 2 2p 2. The highest principal quantum number is 2. There are 2 electrons in the 2s subshell and 2 electrons in the 2 p subshell, giving carbon a total of four valence electrons. Bromine’s ground state electron configuration is 1s 2 2s 2 p 6 3s 2 p 6 d 10 4s 2 4p 5.
