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.
Time for an atom lesson: Chlorine is number 17 on the Periodic Table, which means it has 17 protons. Chlorine-37 has 37 total protons and ne â¦ utrons (that is not a coincidence-- Carbon-12 has 12 total, Hydrogen-1 has 1 total, etc.). The rest is simple math- 37 total minus 17 protons equals 20 neutrons.