If 500. g of water is added to 75 g of 25% NaCl solution, what is the percent by mass of NaCl in the diluted solution?
Chapter 9: Models of Chemical Bonding Week of Jan. 15, 2018 Valence Electrons The electrons in the highest energy level, and the outer shell, that is involved in reactions and bonding. The number of valence electrons can be determined by the group number of the element. Octet Rule Allows for the atoms to reach their most stable form, which is the electron configuration of the nearest noble gas. Electrons can be gained, lost, or shared to reach an outer shell with 8 electrons. Ionic Bond An electrostatic attraction between positive and negative ions causes a chemical bond to form. In this kind of bond, electrons are transferred (usually from groups 1A or 2A to groups 6A or 7A). Positive ions are known as cations, and negative ions are known as anions. Covalent Bond A bo