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In a sodium atom (atomic number = 11 and mass number = 23) and the number of neutrons is
(a) equal to the number of protons
(b) less than the number of protons
(c) greater than the number of protons
(d) none of these

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Neutrons= mass no - Atomic no(no of protons) Neutrons in Na is 23-11=12 Ans: greaterthan no of protons
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IT Professional with more than 5 years of teaching experience

atomic number = 11 means, there are 11 electrons and 11 protons. mass number =23 indicates there 11 protons whose mass = 11 x 1 amu =11 amu and 23-11 = 12 neutrons whose mass = 12 x 1 amu =12 amu.Hence in a sodium atom, there are 11 electrons, 11 protons and 12 neutrons.Correct answer is option CNote-...
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atomic number = 11 means, there are 11 electrons and 11 protons. mass number =23 indicates there 11 protons whose mass = 11 x 1 amu =11 amu and 23-11 = 12 neutrons whose mass = 12  x 1 amu =12 amu.
Hence in a sodium atom, there are 11 electrons, 11 protons and 12 neutrons.
Correct answer is option C


Note- mass of 1 proton = mass of 1 neutron = 1 amu

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Answer is (C)
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Science sensation biology king neet expert

An atomic number of 11 means this atom will have 11 protons. A mass number of 23 means 23 - 11 this atom will have 12 neutrons. Since this atom is neutral the positive protons must be equal to the negative electrons.
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