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Increase across the period

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  • What is the trend in first ionisation energy across period 3?

  • The first ionisation energy generally increases across period 3. However, the trend needs a more detailed consideration than the trend in group 2. This is because the first ionisation energy: decreases from phosphorus to sulfur then increases again.

  • What is the first ionization energy?

  • Ionization energy is the energy required to remove an electron from a gaseous atom or ion. The first or initial ionization energy or Ei of an atom or molecule is the energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions.

  • What happens to ionization energy as you move across a period?

  • Moving left to right across a period, atomic radius decreases, so electrons are more attracted to the (closer) nucleus. The general trend is for ionization energy to decrease moving from top to bottom down a periodic table group. Moving down a group, a valence shell is added.

  • What are the key points in the ionization energy curve?

  • Key Points. Ionization energy exhibits periodicity on the periodic table. The general trend is for ionization energy to increase moving from left to right across an element period. Moving left to right across a period, atomic radius decreases, so electrons are more attracted to the (closer) nucleus.

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