Collision theory states that the rate of a chemical reaction is proportional to the number of collisions between reactant molecules. The more often reactant molecules collide, the more often they react with one another, and the faster the reaction rate
When electrons are gained the element is negatively charged and when electrons are loss the element is positively charged
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the modals of arrangement for first periodic table was. increasing atomic mass and grouping together of elements having similar properties
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Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.