How to tell how many valence electrons from periodic table

Posted on by

How can you tell valence electrons from the periodic table?

how to tell how many valence electrons from periodic table

The valence electrons (VE) are the electrons in the outer shell of an atom. The The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. The charge on an atom tells you how much of a deviation there is from an element's.


The group number indicates the number of valence electrons for the elements in the group. For the representative elements, groups 1 and 2, and , the valence electrons can be determined from the group number. For groups 1 and 2, the number of valence electrons for elements in those groups is 1 and 2 respectively. For groups , subtract 10 to get the number of valence electrons for elements in those groups, so group 13 elements have 3 valence electrons, and group 14 elements have 4 valence electrons, and so on. If you use a periodic table with A and B groups, the A groups are the representative elements. The Roman numerals associated with the A groups give the number of valence electrons for the elements in those groups.

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Science Chemistry Periodic table Introduction to the periodic table. The periodic table - classification of elements. Groups of the periodic table.

Electrons orbit around the nucleus of an atom at set energy levels known as principal energy levels, or electron shells.
how many holes does breast milk come out of

In chemistry , a valence electron is an outer shell electron that is associated with an atom , and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond , both atoms in the bond contribute one valence electron in order to form a shared pair. The presence of valence electrons can determine the element 's chemical properties, such as its valence —whether it may bond with other elements and, if so, how readily and with how many. For a main group element , a valence electron can exist only in the outermost electron shell ; in a transition metal , a valence electron can also be in an inner shell. An atom with a closed shell of valence electrons corresponding to an electron configuration s 2 p 6 tends to be chemically inert. Atoms with one or two valence electrons more than a closed shell are highly reactive due to the relatively low energy to remove the extra valence electrons to form a positive ion. Atoms with one or two electrons less than a closed shell are reactive due to their tendency either to gain the missing valence electrons thereby forming a negative ion , or to share valence electrons thereby forming a covalent bond.

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. I want an high-school level answer. What I mean with "valence electrons" is the outermost electrons in that atoms' electronic arrangement? For example, 3 in an atom with an electronic arrangement of 2, 8, 3.

When we talk about chemistry, we are talking about the building blocks of the universe as we know it. That class will build your foundation for further learning. It even covers the point of this article about the electrons that are part of what make it all happen, the so-called valence electrons. Lets start with atoms. Atoms are made up of protons positively charged particles , electrons negatively charged particles and neutrons no charge. The nucleus is where the protons and neutrons reside, giving the atom its weight.

Valence electron



5 thoughts on “How to tell how many valence electrons from periodic table

  1. Find a periodic table of elements. This is a color-coded table made up of many different squares that lists all of the to determine the number of valence electrons in the.

  2. atoms - Is there an easy way to find number of valence electrons" - Chemistry Stack Exchange

Leave a Reply