The mass number of an atom is:
Correct answer: D. The number of neutrons and protons
- A. The number of electrons
- B. The number of neutrons
- C. The number of protons
- D. The number of neutrons and protons
Explanation
The mass number of an atom is defined as the sum of protons and neutrons that are present inside the nucleus of an atom. For example, the mass number of carbon is 12.01 amu as it has 6 protons and 6 neutrons in its nucleus.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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