Okay, so for chlorine, we see that we have our seven valence electrons in the outer shell, with all the remaining electrons serving as our inner core electrons. And in this third show we have our seven valence electrons, The remaining 10 electrons are in shells too, And one they total up to a total of electrons. And you can see here with this representation of the chlorine atom We have here are 3rd shell, so and equals three. We can see this general size trend in the following periodic table. Electronegativity decreases as we move down a column in the periodic table. So that would mean out of the 17 total electrons. Moving down a column in the periodic table, valence electrons are held less tightly because they get further from the nucleus. Chlorine has an atomic number of 17 When it is neutral it has 17 protons. Using the variable n to represent the number of the valence electron shell, write the valence shell electron configuration for each group. So you're gonna say total electrons Which is connected to your atomic number for neutral element equals your valence electrons plus your inner core electrons. The shape of the periodic table reflects the order in which electron shells and subshells fill with electrons. We're going to say here that your total number of electrons. So these are the remaining electrons that are not valence electrons. Now, besides the valence electrons, all the remaining electrons are called your inner core electrons. Now these valence electrons are the outer shell electrons involved in forming chemical bonds. Now for main group elements were going to say that the number of valence electrons that they possess equals their group number.
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