Important Characteristics of Periods

Periodic Table

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The modern periodic table includes 18 groups and 7 periods.

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Characteristics of Periods

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There are seven periods or rows in a periodic table.

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In a period, the valence electrons occupy the last shell.

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As the electron configuration changes in a period, the chemical properties also change.

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The atomic size of elements in a period decreases from left to right.

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Valence electrons in a period increase from 1 to 4 and decrease from 4 to 0 as we go from left to right.

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The metallic character of elements decreases from left to right in the periodic table.

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