(4) The atomic number of sodium is 11 and its mass number is 23. It has…...................
A) 11 neutron and 12 protons
B) 12 protons and 11 neutrons
C) 11 electron and 12 neutrons
D) 12 electrons and 11 neutrons
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(4) The atomic number of sodium is 11 and its mass number is 23. It has…...................
A) 11 neutron and 12 protons
B) 12 protons and 11 neutrons
C) 11 electron and 12 neutrons
D) 12 electrons and 11 neutrons
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c) 11 electrons and 12 neutrons...
Atomic number is no. of protons in an atom.... but protons is equal to no. of electrons in an atom so.... here atomic number is equal to the no. of electrons i.e. 11.... now the mass no. = atomic number+no. of neutrons
==> no. of neutrons = mass no. - atomic number => no. of neutrons = 23 - 11 = 12 neutrons....
So c) is correct...
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