Chem Notes 091310 - Periodic Table Mendeleev in 1869...

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

View Full Document Right Arrow Icon
Periodic Table: Mendeleev , in 1869, organized the elements based on their weight, and began to notice patterns in their properties. --for example, starting from lithium, periodically would find very violent reactors, and the one before it is very gaseous and not reactant, etc. --discovered then that this organization is based on its atomic number, not mass, and eventually composed our modern periodic table. Jagged line near the left is important— everything to the left is a metal, and everything to the right is a nonmetal. Way right (blue) is the noble gases—called so because they don’t interact. Halogens, to the left of them, are highly reactive and negatively charged of the ones form the right. Metals, on the other hand, lose electrons to react. Can split up as the main elements, which are the ones on the sides, and the red area in the middle are the “transition metals.” The bottom are lanthanoids and actinoids are the separated area on the bottom—got messy once they discovered more elements and had to insert these in the two boxes indicated.
Image of page 1

Info iconThis 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