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Electronic configurations and periodicty

  1. Nov 1, 2012 #1
    An element with the following electronic configuration: [Ar]3d3 4s2
    a) what. Does it belong to? Period 4
    b) what is its group number? Group 5
    c) what kind of element is it? Transition metal
    d) how many of how electrons are there in an atom of this element? 3

    2. what atom has this electronic configuration? 1s2 2s2 2p6 3s2 3p1
    Aluminum Al
    3. which of the following atoms or ions are diamagnetic?
    Br3+ S C F- Cr2+

    b) which of the following ions or atoms are paramagnetic?
    As Zn Mg2+ C2+ Mn4+
    4. which following elements has +3 ion with 2 unpaired electrons?
    As Cl Fe Sc Cr

    5. use periodic trends and predict which of the following elements has the largest first ionization energy
    Sr Cl Cs Br
    6. use periodic trends to predict which of the following elements has the largest atomic radius
    S Ar He Ge

    7. use periodic trends and predict which of the following items has the largest radius
    N3- F- Mg2+ O2-

    8. use a noble-gas notation and write the ground-state electronic configuration of the following ions: Cs+ Ge2+ Cu2+

    9. write the equation representing the second ionization energy for Mn [Ar]3d5
    b) the electron affinity of Br is 325 kJ/mol Write the equation for which this is the energy change

    10. each of the following oxides reacts with water to produce an acid or a base, depending on whether the oxide is an acidic or basic oxide. Give the formula of the products of this reaction.
    SrO B2O3 Br2O5

    everything in red is answered and the rest i need help with, someone please help me thanks !
  2. jcsd
  3. Nov 3, 2012 #2


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    Staff: Mentor

    Not that I checked if answers given were correct.


    Where is the problem? Start with chemical properties (does Cl3+ exist?), then write configurations.

    What trends do you know? Can you write configurations? If ion has a configuration of some other element, is there anything you can predict about its radius?

    For Li+ it would be just [He].

    This is not an equation yet, for an equation you need both reactant and products.

    Nothing to do with the electronic configurations.
  4. Nov 4, 2012 #3


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    Science Advisor

    In 3b also As is paramagnetic
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