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Periodic Table
Structure and Trends
Modern Periodic Table
The arrangement of the elements in order of increasing atomic number in
which elements with similar properties are grouped in columns.
Periodic table trends: Atomic
• Atomic radius: Half the distance between
the nuclei of two atoms.
• R is the radius of the atom.
Variation of atomic radii (pm)
Atomic radius increases
In a column
Across a row
Atomic radius decreases
Sample questions
Q. Which atom has greater atomic
1. C or N?
2. O or S?
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