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Periodic Properties - Ionisation Potential (Ionisation Energy)

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Topics

  • Definition: Ionisation Energy
  • Key Points: Ionisation Potential
CISCE: Class 10

Definition: Ionisation Energy

The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ionisation potential (l.P) or ionisation energy (I.E.) or first ionisation energy (IE1).

CISCE: Class 10

Key Points: Ionisation Potential

  • Ionisation energy is the energy needed to remove an electron from a neutral gaseous atom to form a positive ion.
  • Larger atomic size → lower ionisation energy because outer electrons are farther from the nucleus.
  • Higher nuclear charge → higher ionisation energy due to stronger attraction of electrons.
  • Across a period, ionisation energy increases from left to right as atomic size decreases.
  • Down a group, ionisation energy decreases with increasing atomic size; metals have low I.E., non‑metals have high I.E.
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