posted by .

Why do the metallic elements of a given period (horizontal row) typically have much lower ionization energies than do the nonmetallic elements of the same period?


    Typically, the outside electrons in the non-metals "see" a higher positive charge and that makes it harder to dislodge the electron. For example, look at Na and Cl. Na has 11+ charges in the nucleus; Cl has 17+.

    11* 2e shell 8e shell 1e shell
    17* 2e shell 8e shell 7e shell.
    So the Na (11+ charges) pulls on that outside single electron by about 1 charge (11 + shielded by 10 e = about 1)

    The Cl sees about (17+ charges shielded by 10 e = about 7+ charges); therefore, the outside electrons in Cl are harder to pull away, thus a higher ionization energy.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    what is the difference between elements in a group and elements in a period on the periodic table Elements in the same group have similar chemical properties. Element in the same period have properties that change periodically across …
  2. chemistry

    How can I determine which elements have higher first and second ionization energies than other elements?
  3. math

    For the set X={m,n.p,q,r,s}, let R be the relation on P(X) (power set) given by A R B iff A and B have the same number of elements. List all the elements in {m}/R (equivalence class); in {m,n,p,q,r,s}/R. How many elements are in X/R?
  4. chemistry - ionization energy(check + help)

    I need help understanding by boron does not follow the ionization trend across the period is lower than the first two elements in the same period, where as it should be higher. has it got to do with the p block having an electron, …
  5. chemistry

    Hi, my question: The first five ionization energies of three different elements are: 1. 570 1800 2700 11600 15000 2. 740 1450 7730 10540 13600 3. 800 2400 3600 25020 32820 Which one of those elements is the most electronegative?
  6. CHEM AP please help!!

    Why does the octet rule not hold for many compounds containing elements in the third row of the periodic table and beyond?
  7. CHEM Periodic Trends

    Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false. Within a family, elements with higher atomic numbers …
  8. chemistry

    which of the following is true regarding the transition elements?
  9. chemistry

    For the elements in row 2 of the PT discover the relationship between ionization and the family number of the element Element. Family. Ionization Ener Lithium. 1 13.6 beryllium. 2. 9.3 boron. 13. 8.3 carbon. 1 4. 11.27 nitrogen. 15 …
  10. Chemistry

    Explain why only four ionization energies are listed for Beryllium in the table listing ionization energies of elements.

More Similar Questions