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.
30 valence electrons. Valence electrons are on the outer shell of a atom. To find valence electrons, subtract the amount of electrons the noble gas has before the element fro â¦ m the number of electrons the element actually has.Since the noble gas before carbon is Helium, you subtract 2 electrons from 6 electrons which gives you 4 valence electrons.ince there are 6 carbon atoms, multiply 4 by 6 to get 24. Do the same to the hydrogen atoms and add the valence electrons of the two molecules together and you should get 30 total valence electrons.