PPT-Valence Electrons Day 1

Review Electrons are the negatively charged part of the atom Electrons are found in orbitals around the nucleus We write the electron configuration of the element to see the different orbitals. Table. Dmitri. . Mendeleev. . organized the known elements into a table called the periodic table.. He organized them by their increasing atomic masses.. Today we organize the. . elements. . by their increasing. 21. Which of the trends below describe atomic radius, ionization energy, and electron affinity?. A. B. C. Increases. Increases. Increases. Increases. Increases. Increases. Ionization energy, Electron Affinity, Electronegativity. How they are formed. Valence Electrons. Valence Electrons of an atom are the electrons that are in the outermost s and p sub shells. (ONLY S AND P). To determine how many electrons are in your valence shell, look at where your element is on the periodic table.. Electrons:. ELECTRONS AVAILABLE FOR BONDING . Ga. . Standards. Students . know . how to use the periodic table to determine the number of electrons available for bonding. .. . Students know . how to draw Lewis dot structures.. What is a valence electron?. The electrons in the last shell or energy level. These determine how an atom behaves, reactivity, bonding. These are the only electrons we need to worry about from now on. Rule Breakers . . Some molecules disobey octet rule. C, N, O, and F are mostly rule keepers. 1) Odd Number of Valence Electrons. 2) Incomplete Octets. 3) Expanded Valence Shells . Molecular Exceptions to the Octet Rule. Bonding . Basics. And REVIEW!. Bonding is an example of a . chemical. change. Bonding occurs when . 2 or more atoms. . are chemically joined . When 2 or more atoms bond that is called a . molecule. Chemical Reactivity. The reactivity of an element depends on the number of . valence electrons. .. If . the outer shell . of an atom already . contains . 8 valence electrons. , this means . the atom has . th. , 2018. Pre-Class:. Get your periodic table. Tell me some patterns you see. . They can be obvious…. Places to Look. : Atomic number, atomic mass. Things to Guess. : Atomic “size,” nuclear charge, location of metals, gases, liquids?. The Bachelor: Atom edition Atoms are lonely hearts that are constantly in search of partners to bring stability to their lives. Your job is to play matchmaker and make each atom stable by determining how many valence electrons each element needs and finding a partner that will complete the valence energy level. PS21. Friday, January 27, 2017. Worst Taught Science Topics in Middle and High School Chemistry/Physical Science?. 1) Electronic structure (Bohr model) of the atom. 2) Eight electron rule for chemical bonding. 4.2. Main Group Elements A. The main group elements are group A elements: 1-8, and they do not include the transition metals or the rare earth elements (lanthanides and the actinides).. Following the Octet Rule. Semiconductors and their properties. Materials used for electronic components . . Like resistors. Like capacitors. Like diodes. Like transistors. Like inductors. Semiconductor materials. Conductivity lies between conductor and insulator. :- . Asst. Prof. . Sachin. P . Patil. Chemistry Department. S T Co-Op Education Society’s, Science Senior College, . Shahada. .. Development of Periodic Table. Elements in the same group generally have similar chemical properties..