SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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13
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12.01
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6
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26
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Detailed explanation-1: -For example, carbon has six protons and is atomic number 6. Carbon occurs naturally in three isotopes: carbon 12, which has 6 neutrons (plus 6 protons equals 12), carbon 13, which has 7 neutrons, and carbon 14, which has 8 neutrons. Every element has its own number of isotopes.
Detailed explanation-2: -Answer and Explanation: The atomic number for carbon-13 is six. This is the same atomic number for carbon-12 and carbon-14.
Detailed explanation-3: -The sum of protons plus neutrons equals the mass number 12 in 12C, so carbon-12 has 12 – 6 protons = 6 neutrons. The sum of protons plus neutrons equals the mass number 13 in 13C, so carbon-13 has 13-6 protons = 7 neutrons.
Detailed explanation-4: -The nucleus of 136C has a mass of 13 u. Each neutron has a mass of 1 u.
Detailed explanation-5: -Aluminum is a chemical element with symbol Al and atomic number 13.