SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An atom has 13 protons, 15 neutrons and ____ electrons what is its mass number?
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13
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26
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28
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15
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Explanation:
Detailed explanation-1: -Answer. Explanation: The mass of an element, also called its atomic mass, can be calculated by adding the number of protons and neutrons. Therefore, the atomic mass is 28.
Detailed explanation-2: -The mass number of silicon is 28.
Detailed explanation-3: -The difference between the protons and electrons dictates the charge of the atom while the sum of the protons and neutrons gives its mass number. Thus, an ion with 13 protons, 10 electrons, and 15 neutrons is a cation with an atomic number of 13, mass number of 28, and charge of +3.
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