GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the atomic number is 10 and the atomic mass is 23.10, how many protons does that atom have?
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10
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23.10
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13
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23
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Explanation:
Detailed explanation-1: -The mass number is given at the top left of the elements symbol, for example, sodium has a mass number of 23. We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
Detailed explanation-2: -The mass number gives a sum of the neutrons and protons in the nucleus. Thus an atomic number of 10 means there are 10 protons present. If we have ten protons and a mass number of 24, we know that 24-10 = 14 which gives us the number of neutrons present or 14 neutrons in this case. The answer is C: 14 neutrons.
Detailed explanation-3: -Hence, if an atom has atomic mass number 23 and atomic number 11, then the number of electrons is 11.
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