2022-01-14T17:40:23+03:00[Europe/Moscow] en true <p>definition of the first electron affinity </p>, <p>first electron affinity symbol</p>, <p>standard example equation to show the first electron affinity </p>, <p>is <strong><em>EA<sub>1</sub></em></strong> usually exothermic or endothermic</p>, <p>in which case are successive electron affinities used?</p>, <p>what do the 2nd and 3rd electron affinities respresent</p>, <p>are the 2nd and 3rd electron affinities endothermic or exothermic </p>, <p>why are the 2nd and 3rd electron affinities endo and not exo?</p>, <p>what is the value of the electron affinity depend on </p>, <p>the more energy i released ( more exothermic, more negative) the EA value is, the</p>, <p>the factors affecting the electron affinity of an element are the same as those affecting</p>, <p>what are ionisation energies for ?</p>, <p>3 factors influencing EAs and IEs</p>, <p>the greater the nuclear charge, the</p>, <p>the greater the distance between the nucleus and outermost shell/orbital where the electron is added, the</p>, <p>the greater the number of shells, the</p> flashcards

A2 Level Electron Affinity

CIE Syllabus

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  • definition of the first electron affinity

    the enthalpy change when 1 mole of electrons is added to 1 mole of gaseous atoms to form 1 mole of gaseous ions each with a single negative charge under standard conditions

  • first electron affinity symbol

    EA1

  • standard example equation to show the first electron affinity

    X(g) + e– → X–(g)

  • is EA1 usually exothermic or endothermic

    exothermic ( energy is released), negative number

  • in which case are successive electron affinities used?

    where an element accepts more than one electron

  • what do the 2nd and 3rd electron affinities respresent

    the formation of 1mole of of gaseous ions with 2- and 3- charges respectively

  • are the 2nd and 3rd electron affinities endothermic or exothermic

    endothermic (energy is absorbed)

  • why are the 2nd and 3rd electron affinities endo and not exo?

    the incoming electron is being added to an already negative ion

    energy is required to overcome the repulsive forces between them

  • what is the value of the electron affinity depend on

    how strongly the incoming electron is attracted to the nucleus

  • the more energy i released ( more exothermic, more negative) the EA value is, the

    greater the attractive forces between the electron and nucleus

  • the factors affecting the electron affinity of an element are the same as those affecting

    ionisation energies

  • what are ionisation energies for ?

    the formation of positive ions via the loss of electrons

  • 3 factors influencing EAs and IEs

    nuclear charge

    distance from nucleus

    shielding between

  • the greater the nuclear charge, the

    stronger the attractive forces between an incoming electron and the nucleus

  • the greater the distance between the nucleus and outermost shell/orbital where the electron is added, the

    weaker the force of attraction

  • the greater the number of shells, the

    greater the shielding effect and the weaker the force of attraction