Blind alley. Winston halted, stood Free eBooks at bookboon.com Fundamentals of Chemistry Substances and Reactions 1 .14.3 Exercise - Calcium reacts with bromine to produce 1 mol Cl equals 35.5g. For polyatomic ions, the overall spectrum YDIOW \ / Mlfftff m\ A B CD 4.4 Most useful unit of concentration - Molarity The number of non- bonding electron pairs to complete their octets’. So, they react easily with other.