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An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. An atomic mass unit is used to measure atomic and molecular masses based on carbon-12. Unified atomic mass unit, or u, is the preferred term in the SI measurement system. One AMU is equal to 1 u or 1 Da, and was redefined based on carbon-12 in 1961. Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units. In this scale, 1 atomic mass unit (amu) corresponds to 1.66 x 10^−24 gram. Define the atomic mass unit. Welcome to the NCERT Solutions for Class 9 Science - Chapter Atoms and Molecules. This page offers a step-by-step solution to the specific question from Exercise 2, Question 1: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams.
