2/10/10

Post date: Feb 10, 2010 4:25:20 PM

Bell Activity: Why do people form connections with other people?

    • Why chemical bonds form

      • Each atom wants to have a stable number of electrons

    • More atom anatomy

      • Charges

        • Atoms are made of protons, neutrons, and electrons

        • Protons have positive charge, electrons have a negative charge, neutrons have no charge

        • When not bonded, atoms have the same number of protons and electrons, so net charge is 0

      • Electrons

        • Arranged in different levels or orbitals, with each level being able to hold a certain number of electrons

        • Valance electrons - the electrons in the outer-most level, involved in chemical bonding

          • Periodic table shows us how many valence electrons different atoms have by which column the element is in

        • Atoms want to have their outermost electron level filled up completely, and can do this in 2 ways

          • Take more electrons from another atom or give up electrons to another atom

            • When an atom gains electrons or gives them up, it is called an ion

          • Share electrons with another atom

          • These two methods result in 2 different types of bonds