When moving across a period from left to right in

What happens to the atomic mass of the elements moving from left to right within a period?It decreases. It increases. It
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In what period did life first show up?27 seconds left to answer 27 The Cambrian Period The Hadean Period The Wakandan Period The
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In what period did Dinosaurs show up?16 seconds left to answer 16 The Triassic Period The Cretaceous Period Permian Period The
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In what period did mammals show up?27 seconds left to answer 27 The Paleogene Period The Cambrian period The Jurassic Period The
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In what period did dinosaurs go extinct?18 seconds left to answer 18 The Paleogene Period The Triassic Period The Cretaceous
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In what period did the T-Rex show up?18 seconds left to answer 18 The Triassic Period The Cambrian Period The Cretaceous Period
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In what period did homosapiens appear?28 seconds left to answer 28 The Permian Period The Paleogene Period The Quatenary Period
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In what Period did the Dimetrodon appear?26 seconds left to answer 26 The Triassic Period The Cambrian Period The Permian Period
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For nonmetals, how does chemical reactivity trend in a period?It increases across (left to right) a period. It decreases across
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When moving across a period from left to right in the periodic table which trend occurs
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