Ocr B Chemistry F331

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OCR B CHEMISTRY F331 (Unit 1) Revision Guide 2014 Formulae, equations and amount of substance | Key Terms (a). * Atomic Number: Atomic number is the number of protons in the nucleus. * Mass Number: Mass number is defined as the sum of the numbers of protons and neutrons in the atom’s nucleus. * Isotopes: Atoms with the same number of protons but different number of neutrons are called isotopes; they therefore have different masses. * Avogadro’s constant: The number of toms per mole is called the Avogadro’s constant. It has a value of 6.02x10^23. * Relative atomic mass: The relative atomic mass of an element is the average mass of one atom of the element relative to 1/12th the mass of one atom of carbon-1 (Ar), On a scale

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