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Moving from left to right across the periodic table

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37.Moving from left to right across the periodic table atomic radius. This is because….a.increases; there are more electrons, which adds additional electron orbitals.b.decreases; there are more protons, which means less coulombic attraction.c.increases; there are more protons, which means less coulombic attraction.d.decreases; there are more protons, which means more coulombic attraction.
38.Moving from top to bottom across the periodic table, electronegativity. This is because….
39.Which of the following correctly lists the five atoms in order of increasing size (smallest to largest)?
e.F < Br < Ge < Rb < K40.In which of the following atoms is the 3s orbital closest to the nucleus?
41.The atomic radius of main-group elements generally increases down a group because.a.effective nuclear charge increases down a groupb.effective nuclear charge decreases down a groupc.effective nuclear charge zigzags down a groupd.the principal quantum number of the valence orbitals increasese.botheffective nuclear charge increases down a group andthe principal quantum number of the valenceorbitals increases

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