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Electronegativity is a measure of the tendency of an atom to attract a shared pair of electrons towards itself. Elements Na Mg Al SI P S Cl Ar Electronegativity 0.93 1.13 1.81 2.02 2.19 2.58 3.16 - Note that EN of Ar is not included. Electronegativity is related to the tendency of an atom to attract the shared pair to attract the shared pair of electrons. Since Argon does not form covalent bonds, you obviously cannot assign it an electronegativity value. Moving from one elements to the next across the period, nuclear charge increases by 1 unit and one electron is added to the outer shell. As the positive charge on the nucleus rises, the atom has increasing electron attracting power and therefore an increasing electronegativity.

Independent and Dependent Variable The independent variable and dependent variable are examined in any experiment using the scientific method, so it's important to know what they are and how to use them. Here are the definitions for independent and dependent variables, examples of each variable, and the explanation for how to graph them. Independent Variable The independent variable is the condition that you change in an experiment. It is the variable you control. It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Dependent Variable The dependent variable is the condition that you measure in an experiment. You are assessing how it responds to a change in the independent variable, so you can think of it as depending on the independent variable. Independent and Dependent Variable Examples In a study to determine whether how long a student sleeps affects test scores, the in...

Chemistry From Wikipedia, the free encyclopedia For other uses, see Chemistry (disambiguation). "Chemical science" redirects here. For the Royal Society of Chemistry journal, see Chemical Science (journal). Solutions of substances in flasks, including ammonium hydroxide and nitric acid, illuminated in different colors. Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter.Chemistry is chiefly concerned with atoms and molecules and their interactions and transformations, for example, the properties of the chemical bonds formed between atoms to create chemical compounds. As such, chemistry studies the involvement of electrons and various forms of energy in photochemical reactions, oxidation-reduction reactions, changes in phases of matter, and separation of mixtures. Preparation and properties of complex substances, such as alloys, polymers, biological molecules, and pharmaceutical agents are consi...