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Periodic Table Trends

across→r↓  down↓r↑\text{across} \rightarrow r{\downarrow}\; \text{down} \downarrow r{\uparrow}
ElementSi · Silicon
Atomic radius136 pm
Ionisation energy850 kJ/mol
Electronegativity2.0
  • Find fluorine (F) — group 7, period 2
  • Find the largest atom (bottom-left of the table)
  • Find the element that holds its electrons most tightly (highest ionisation energy)
  • Find the most electronegative element
  • Find the most reactive metal (lowest ionisation energy)