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www.wolframalpha.com/widgets/view.jsp?id=9e57f78cdc3a5f5052ff53af3...

Get the free "Valence Shell Calculator" widget for your website, blog, Wordpress, Blogger, or iGoogle. Find more Chemistry widgets in Wolfram|Alpha.

www.wolframalpha.com/widgets/view.jsp?id=bd4637e2261cbcdda20d9077e...

Get the free "Electron Configuration Calculator" widget for your website, blog, Wordpress, Blogger, or iGoogle. Find more Chemistry widgets in Wolfram|Alpha.

www.wikihow.com/Find-Valence-Electrons

How to Find Valence Electrons. In chemistry, valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds...

sciencing.com/calculate-electron-configuration-6018333.html

To calculate an electron configuration, divide the periodic table into sections to represent the atomic orbitals, the regions where electrons are contained. Groups one and two are the s-block, three through 12 represent the d-block, 13 to 18 are the p-block and the two rows at the bottom are the f-block.

sciencing.com/calculate-valence-8566718.html

Familiarize yourself with the electronic configuration of each shell level. Each atom has two electrons on its innermost shell and up to eight electrons on each shell after that. For example, since Lithium has three electrons, it will have two electrons in its inner shell and one electron on its outer shell.

chemaxon.com/.../latest/help/sci/ValenceCalculator.html

Valence calculator provides two ways to check the valence of an atom having aromatic bonds: Local Aromatic Valence Calculator uses only the bond and ligand information of the considered atom to do valence calculations. Hence, this method is faster, but often chemically incorrect.

www.edurite.com/kbase/electron-configuration-calculator

Question:I understand how to write the electron configurations of elements that only use the s orbital and p orbital, but when there are more than 3 energy levels with more than 8 electrons, you begin to use d orbitals and f orbitals.How do I do that? What is an easy way to calculate the electron configurations of elements in the d- and f- blocks? And how do I calculate the electron ...

socratic.org/questions/how-can-i-calculate-the-valence...

Valence electrons are the electrons contained in the outermost or valence shell of an atom or ion. > You determine the valence electrons by using the Periodic Table. Let's assume you're using a table that has the groups numbered 1-18. The electron configurations of ions are those of the neutral atoms plus or minus a number of electrons equal to the charge on the ion.

study.com/academy/lesson/valence-electron-definition...

Before we dive into valence electron configuration, let us first review electron configuration. An electron configuration is the arrangement of electrons around the nucleus of an atom, just as we ...

mmsphyschem.com/elecConfig.htm

Electron Configurations. This program determines the information shown below for either an atom or an ion. Conventional notation is used, i.e. - the first letter of an element is capitalized and the second is a small letter. When entering the charge for an ion, it can be entered as +2 or 2+, i.e. Ca 2+ or Ca +2.