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Barium has a larger atomic radius because it has more energy levels and a larger shielding effect. Silicon has a smaller atomic radius because it has a stronger nuclear charge. ... Aluminum has a higher ionization energy than indium because there are fewer energy levels so it is more challenging to remove an electron.
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The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods
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Im pretty sure its A.) How many protons