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The Periodic Law Slide Quiz In the modern periodic table, elements are arranged according to what? Group 17 (halogens) are the most reactive of the nonmetals because? What does the periodic law state? Across period 3 (left to right), the energy needed to remove an electron from an atom (increases/decreases)? What is the above periodic trend called? Which element has the highest electronegativity? How does ionization trend? How does atomic radius trend? Why does atomic radius trend this way? How does electronegativity trend?
