Valence electrons practice, Ejercicios de Cultura Científica

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Valence Electron Practice Name: Nicolas Cabrera Period: 1. What is a valence electron and why are they important to a chemist? Valence electrons are those electrons farthest away from the nucleus of an atom. They are important in chemistry because they are responsible for determining the chemical behavior of an atom 2. How can you find the number of valence electrons an element has? The number of valence electrons is equal to the atom's main group number. 3. How many protons are in the following elements? A. Carbon B. Hydrogen C. Oxygen D. Phosphorus E. Calcium 6 7 O 15 20 4. Draw the atomic structures for the following. Include the number of protons, neutrons and draw in the valence electrons. A. Silicon B. Potassium Number of protons: 14 Number of protons: 19 Number of electrons: 2, 8, 4 Number of electrons: 19 4 valence electrons 1 valence electron C. Sulfur D. Beryllium Number of protons: 16 Number of protons: 4 Number of electrons: 2, 8, 6 Number of electrons: 2,2 6 valence electrons 2 valence electrons E. Argon F. Nitrogen Number of protons: 18 Number of protons: 7 Number of electrons: 2, 8, 8 Number of electrones 8 valence electrons 2,3 5 valence electrons