Which statement describes the trend in first ionization energy for elements on the periodic table?
it generally decreases down a group because valence electrons are farther from the nucleus.
it generally decreases across a period because effective nuclear charge decreases.
it generally increases down a group because valence electrons are farther from the nucleus.
it generally increases across a period because effective nuclear charge decreases.
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Which statement describes the trend in first ionization energy for elements on the periodic table?...
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