The scientific study of chemical changes and their kinetics is another form of reactivity definition. It is a measurement of how much a substance reacts with others. In general, the reactivity definition is the degree to which a substance shows chemical change when mixed with another substance. In this section, we shall discuss elements’ reactivity and trends in the Periodic Table. But why does it happen? And what is this affinity? How does reactivity vary in the Periodic Table? Like some elements show more affinity to form bonds with others, while some do not show any affinity. There are many observable patterns in elements’ physical and chemical properties as we move across a period or down in a group in the Periodic Table. These trends are broadly divided into two categories, i.e., physical properties and chemical properties. Includes guidance on Basic Physical Properties /Thermal Stability Data.The elements of the Periodic Table show various trends. Guidelines for Engineering Design for Process Safety.Presents critical guidelines that can significantly reduce the risk or mitigate the severity of accidents associated with storing and handling reactive materials. Guidelines for Safe Storage and Handling of Reactive Materials.Presents performance-based approaches to such hazards as health effects, environmental pollution, fire, and explosion that provides practical means to minimize the risk of these hazards to employees, the surrounding population, the environment, property, and business operations. Guidelines for Safe Warehousing of Chemicals.Provides process engineers with up-to-date on the effective methodologies that process safety demands. Guidelines for Hazard Evaluation Procedures - With Worked Examples.Provides principles and strategies for the evaluation of chemical reactions, and for using this information in process design and management. Guidelines for Chemical Reactivity Evaluation and Application to Process Design.American Institute of Chemical Engineers (AIChE), Center for Chemical Process Safety (CCPS) Guideline Series:.Covers more than 5,000 elements and compounds, along with secondary entries involving two or more compounds, and features extensive cross-referencing, which links similar compounds of incidents not obviously related. Includes every chemical for which documented information on reactive hazards has been identified. Louis, MO: Elsevier Science and Technology Books, 2017. Bretherick's Handbook of Reactive Chemical Hazards. Includes toxicological, fire, reactivity, explosive potential, and regulatory information. Provides information on the hazards of substances used in industry. 12th Edition, New York: John Wiley and Sons, December 2012.

Sax's Dangerous Properties of Industrial Materials. Introduces small-to-medium-sized facilities to a method developed by the Center for Chemical Process Safety (CCPS) to screen facilities for chemical reactivity hazards. EPA Chemical Safety Alert: Identifying Chemical Reactivity Hazards Preliminary Screening Method, May 2004.Proposes a simplified mathematical and tabular method for assessing the risk of exothermic runaway reactions, based on the calculated hazard index. 'An Index-Based Method for Assessing Exothermic Runaway Risk.' Pages 294-304. Process Safety Progress 21.4 (December 2002).Provides a program that can be used to find out about the reactivity of substances or mixtures of substances. Collaboration of several organizations including the Center for Chemical Process Safety, Environmental Protection Agency, NOAA's Office of Response and Restoration, The Materials Technology Institute, Dow Chemical Company, Dupont, Phillips. The following resources aid in evaluating reactive interactions and their potential hazards. The key to evaluating chemical reactivity hazards is to first determine what chemicals exist in the workplace, and then determine which chemicals are reactive with other materials. Determining the potential for interactions is not always easy.