SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
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13
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14
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27
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40
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Explanation:
Detailed explanation-1: -∴ The mass number of aluminium is 27.
Detailed explanation-2: -The mass number of an atom is the sum of the protons and neutrons in the nucleus of that atom. An atom of aluminum with 13 protons and 14 neutrons has a mass number of 27.
Detailed explanation-3: -Aluminium-27 atom is the stable isotope of aluminium with relative atomic mass 26.98153 and nuclear spin (5)/2. A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98.
Detailed explanation-4: -The atomic number of aluminium (Al) is 13, and its mass number is 27.
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