Following is the order of decreasing Δ and energy of light absorbed: [Cr(CN)₆]³⁺ > [Cr(en)₃]³⁺ > [CrCl₆]³⁻.
What is an atom?
The smallest component of ordinary stuff that makes up a chemical element is an atom. Atoms that are neutral or ionized form the solid, liquid, gas, and form of plasma. Atoms are incredibly tiny, measuring typically 100 picometers across. Due to quantum effects, they are so small that it is impossible to predict their behavior with sufficient accuracy using classical physics. Each atom is made up of a nucleus and one or more electrons that are bonded to it. The nucleus of an atom contains more than 99.94% of its mass. The protons are positively charged, whereas the electrons are negatively charged.
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