Common Shortcut Keys. It's hard to remember all the shortcut keys out there. But luckily, most programs adopt conventions (like Ctrl+S, which always saves what you're working on). Even better, programmers typically choose shortcut keys mnemonically (again, like Ctrl+S for Save) to make it easier for us to remember.
This means, that the number of electrons present in an chlorine atom is 17. The energy shells of an atom are in the order K, L, M â¦ So the electronic configuration of chlorine atom is: K, L, M = 2, 8, 7. Valence electrons are the number of electrons present in the outermost shell of an atom. The last shell of a chlorine atom has 7 electrons in it. Therefore, there are 7 valence electrons in an chlorine atom. Here is a video which gives a quick discussion of how to determine how many valence electrons atoms of different elements have.
Example: Let's determine the number of valence electrons in the chlorate (ClO 3 -) ion. A chlorine atom (Group VIIA) has seven valence electrons and each oxygen atom (Group VIA) has six valence electrons. Because the chlorate ion has a charge of -1, this ion contains one more electron than a neutral ClO 3 molecule.Thus, the ClO 3 - ion has a total of 26 valence electrons. ClO 3 - : 7 + 3(6) + 1 = 26. The second step in this process involves deciding which atoms in the molecule are connected by covalent bonds.ecause the chlorate ion has a charge of -1, this ion contains one more electron than a neutral ClO 3 molecule. Thus, the ClO 3 - ion has a total of 26 valence electrons. ClO 3 - : 7 + 3(6) + 1 = 26. The second step in this process involves deciding which atoms in the molecule are connected by covalent bonds.