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# Reviewer **1. Magnesium** * Magnesium is a metallic element found in group IIA of the periodic table. * When magnesium combines with a nonmetal, it tends to lose 2 electrons and form a positive ion. **2. Ammonia (NH3)** * The Lewis electron dot structure of ammonia (NH3) is shown on the right....

# Reviewer **1. Magnesium** * Magnesium is a metallic element found in group IIA of the periodic table. * When magnesium combines with a nonmetal, it tends to lose 2 electrons and form a positive ion. **2. Ammonia (NH3)** * The Lewis electron dot structure of ammonia (NH3) is shown on the right. * There are two lone pairs of electrons present in the NH3 molecule. **3. Final Charge of an Ion** * Using the Lewis Electron Dot Symbol, the final charge of the ion formed is -2. **4. Potassium Oxide (K2O)** * If an electron is lost by a potassium (K) atom and completely transferred to an oxygen (O) atom, the compound formed is K2O. **5. Neutral Atom vs. Negative Ion** * The neutral atom Cl with the negative ion Cl- means that the anion (Cl-) has more electrons than the neutral atom (Cl). **6. Greatest Tendency to Form a Charge** * Based on the Lewis Electron Dot Symbols, barium (Ba) has the greatest tendency to form a +2 charge. **7. Phosphorus Dots** * Phosphorus has five valence electrons, and therefore 5 dots should be drawn in the Lewis electron-dot symbol for phosphorus. **8. H2 Molecule** * The question asks for the correct Lewis electron-dot symbol for the H2 molecule, but the image seems missing this part. **9. Metals as Utensils** * Metals are good materials for kitchen wares like pots due to their excellent conductivity. **10. Ionic Compounds and Conductivity** * Ionic compounds conduct electricity when dissolved in water because they contain charged particles (ions). **11. Delocalized Electrons** * In the electron sea model of metallic bonding, valence electrons are delocalized, meaning they move freely throughout the entire metal structure. **12. Dishwashing Soap and Polarity** * Dishwashing soap has both polar and nonpolar molecules. The polar molecules attract polar water molecules, while the nonpolar molecules attract nonpolar oil molecules. **13. Ionic vs. Covalent Compounds (KCl vs. CH4)** * Potassium chloride (KCl) is an ionic compound, and methane (CH4)is a covalent compound. KCl has a higher melting point because of the strong attractive forces between the ions in the ionic lattice structure. **14. Fluorine Orbital Diagram** * The question asks for the orbital diagram for fluorine (F), but the diagram is missing. **15. Quantum Mechanical Model** * The quantum mechanical model of the atom, proposed by Erwin Schrödinger, is based on quantum theory, which states that matter exhibits wave-like properties. Electrons are described as moving in a region of space around the nucleus called an electron cloud. The location of the electrons is described by a probability function (not a precise orbit). **16. Period and Group from Electronic Configuration** * For the electronic configuration 1s2 2s2 2p6 3s2 3p5: * Period 3 * Group 17 **17. Valence and Core Electrons (1s2 2s2 2p6 3s2 3p5)** * The electronic configuration 1s2 2s2 2p6 3s2 3p5 has 7 valence electrons and 10 core electrons. Please note there are two instances describing this electronic configuration which is unusual. This is important for correctness.