It is also a measure of how many electrons are excited about bonding with other atoms. Valence is a measure of how much an atom wants to bond with other atoms. That trend means that the left side has a positive valence and the right side has a negative valence. If you look at the periodic table, you might notice that elements on the left side usually become positively charged ions (cations) and elements on the right side get a negative charge (anions). Electrovalence is just another word for something that has given up or taken electrons and become an ion. Almost any ion with a negative charge will be interested in bonding with you.ĭon't get worried about the big word. Other electrically charged atoms (ions) of the opposite charge (negative) are now looking at you and seeing a good partner to bond with. You lost an electron and you are "happy." So what makes you interesting to other atoms? Now that you have given up the electron, you are quite electrically attractive. Your whole goal as an atom was to become a "happy atom" with completely filled electron shells. As an ion you are now something completely new. Since you're missing an electron, you aren't really a complete sodium atom either. That's the same number of electrons as neon (Ne). You have one less electron than your atomic number. You are still the element sodium, but you are now a sodium ion (Na +). That missing electron gives you a positive charge. You are also an ion and missing one electron. Chlorine has seventeen electrons and only needs one more to fill its third shell and be "happy." Chlorine will take your extra sodium electron and leave you with 10 electrons inside of two filled shells. Whenever an atom has full shells, we say it is "happy." Let's look at chlorine (Cl). When you lose that electron, you will you’ll have full shells. You need to find another element that will take that electron away from you. What do you do if you are a sodium (Na) atom? You have eleven electrons - one too many to have an entire shell filled. When you have an extra electron or two, you have a negative charge. When you are missing an electron or two, you have a positive charge. Ions are atoms with extra electrons or missing electrons. That means an atom with a neutral charge is one where the number of electrons is equal to the atomic number. A normal atom has a neutral charge with equal numbers of positive and negative particles. The atomic number of an element, also called a proton number, tells you the number of protons or positive particles in an atom.
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