Question

Show by means of a diagram and a simple calculation the minimum value of the radius ratio r+/r- which permits a salt to adopt a caesium chloride type of structure
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Answer 1

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Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. ... The unit of mass in the International System of Units (SI) is the kilogram, which is defined in terms of Planck's constant, which is defined as equal to 6.62607015 × 10−34 joule second.