Explain everything about periodic table

Chemistry

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The periodic table is a tabular arrangement of chemical elements, organized by their atomic number, electron configurations, and recurring chemical properties. Its primary purpose is to display the relationships between different elements and predict their behavior.

Elements are arranged in increasing order of atomic number (number of protons).

  • Periods: Horizontal rows (1-7) represent elements with the same number of electron shells.
  • Groups: Vertical columns (1-18) contain elements with similar chemical properties, primarily due to having the same number of valence electrons.

The table broadly classifies elements into metals (left and center), nonmetals (upper right), and metalloids (along the staircase line). Elements within the same group exhibit similar reactivity and physical characteristics, which is a fundamental concept known as periodicity.

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