SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An element has the mass number 12 and atomic number 6. The number of neutrons in it is:
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6
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10
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4
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8
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Explanation:
Detailed explanation-1: -For most elements other than hydrogen, isotopes are named for their mass number. For example, carbon atoms with the usual 6 neutrons have a mass number of 12 (6 protons + 6 neutrons = 12), so they are called carbon-12.
Detailed explanation-2: -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.
Detailed explanation-3: -That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons.
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