{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter_7 - CHEM 1201 SI Worksheet Chapter 7 Periodic...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM 1201 SI Worksheet Chapter 7 Periodic Trends of the Elements: Effective Nuclear Charge (Z eff ) : the charge felt by the valence electron(s) in an atom by the nucleus. The electron doesn’t feel the complete effect of the positive nucleus b/c of the presence of core electrons o Shielding/Screening: the presence of core electrons that inhibit Z eff o Example: Atomic Size (explanation of trend): o going down P.T.: o going across P.T.: Ionic Size: Cl vs. Cl - Na vs Na + We can only compare radii of isoelectronic ions. Isoelectronic having the same total # of electrons. Examples→ N 3- O 2- F - Na + Mg 2+ Al 3+ # protons # electrons Ionization Energy: The energy required to remove an electron from an atom. The greater the Ionization Energy, the more difficult it is to remove an electron. Octet: Due to the fact that the most stable electron configurations are those of noble gases, main group atoms lose or gain electrons to form ions (cations, anions) whose electron configurations resemble those for the closest noble gas: ns 2
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern