Valence Electrons & Bohr Diagrams

Valence Electrons & Bohr Diagrams Review: Atomic Structure Atoms have a nucleus that contains Protons and Neutrons Electrons are contained in shells that surround the nucleus An atom is made of mostly empty space Protons have a positive charge Electrons have a negative charge Neutrons are Neutral Review: Electrons & Shells

Each electron shell can hold a certain number of electrons Electron shells are filled from the inside out Noble Gases have full outer electron shells All other elements have partially filled outer electron shells Electron Shell

Number of Electrons 1 2 2 8 3 8

4 18 5 18 6 32 7

32 Valence Electrons The electrons in the outer most electron shell are called valence electrons The shell containing electrons that is furthest from the nucleus is called the valence shell The number of electron shells with electrons is the same as the period (row) number Noble Gas Stability

Noble gases (column all the way to the right) are usually unreactive This is because they have full valence shells (a stable octet) An element with a full valence shell is a happy element All elements are trying to get a stable octet! Noble Gas Stability Atoms want to gain stability Atoms will try to gain or lose electrons to have a full valence shell

Bohr Models Niels Bohr created a visual model of the atom to make them easy to understand A Bohr Model contains a central nucleus surrounded by electron shells For each model you state the number of protons and neutrons in the nucleus and draw a dot on the electron shells for each electron To determine the number of valence electrons an element has, you look at the number of electrons in the outermost shell Complete the Bohr Model of the Atom

Arranging Electrons in Energy Levels in your Notebook. For the second half when you are coloring the electrons, remember, you wont use every circle on every shell it depends on how many electrons the element has. For example, Sodium has 11 electrons, so you will only use 11 circles.

Recently Viewed Presentations

  • A Lifelong Relationship With Hawaiian and French Polynesian ...

    A Lifelong Relationship With Hawaiian and French Polynesian ...

    I saw my first sea turtle in Tahiti, a juvenile honu that would have been dinner if not for my poor aim as a spear fisher. Later, walking the shoreline of Bora Bora with Linda, I saw my second sea...
  • A Machine Learning based Approach for Disulfide Bond

    A Machine Learning based Approach for Disulfide Bond

    Prediction of disulfide bonds plays crucial role in ab initio protein structure prediction and protein folding. Improved prediction of disulfide bonds can be useful in improving the accuracy of ab initio protein structure prediction. Since they impose geometrical constrains on...
  • Solutions - Philadelphia University

    Solutions - Philadelphia University

    The aqueous sugar medium of dilute sucrose solutions is an efficient nutrient medium for the growth of microorganisms, particularly yeasts and molds. concentrated sugar solutions are quite resistant to microbial growth because of the unavailability of the water required for...
  • TITLE

    TITLE

    Training Topics Windows 7 eLearning Site Internet Update Gaggle Introduction Schoolwires Information Requirement Must earn 10 points by the end of this year (1 point for initial training, 9 points of your choice) Over a 5 year period earn 60...
  • Partnerships in Learning: linking early childhood services ...

    Partnerships in Learning: linking early childhood services ...

    Partnerships in Learning: linking early childhood services, families and schools for optimal development Dr Jean Ashton with Ass Prof Christine Woodrow, Ass Prof Christine Johnston, Ass Prof June Wangmann, Ms Tanya James & Ms Lin Singh
  • Weber: Health Assessment in Nursing

    Weber: Health Assessment in Nursing

    Equipment for Skin, Hair, and Nail Assessment. Gloves. Examination light and penlight. Mirror for client's self-examination of skin. Magnifying glass. Centimeter ruler. Wood light. Examination gown or drape. Assessment Tool 14-1, Braden Scale For Predicting Pressure Sore Risk. Assessment Tool...
  • Stratified Covariate Balancing is easy ... - Open Online Courses

    Stratified Covariate Balancing is easy ... - Open Online Courses

    Stratified covariate balancing automatically balances the interactions among the covariates. Thus, it overcomes one of the most difficult part of data balancing. Propensity scores, in contrast, balance mostly the main effect and asks the analyst to search for possible interactions,...
  • Grade 7 Canadian History (Term 1) Review for Unit Test

    Grade 7 Canadian History (Term 1) Review for Unit Test

    Describe Aboriginal life and the some of the groups we examined. What was the importance of the fur trade? How did things change when the British take over New France in 1763? What did a seigneury look like? Details?? Can...