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प्रश्न
Make the correct choices in the following:
(a) In one atom of copper (mass number 63, atomic number 29) there are
विकल्प
63 protons and 29 neutrons.
63 protons and 29 electrons.
29 protons and 29 neutrons.
29 protons and 29 electrons.
29 protons and 63 neutrons.
उत्तर
Mass number of copper = 63
Atomic number of copper = 29
As atomic number of element gives number of proton and electrons while mass number of element gives number of protons +number of neutrons.
So, number of protons in copper = atomic number of copper = 29.
Number of electron in copper = number of protons in copper =29.
Number of neutrons = mass number atomic number = 63 29 =34.
So answer is (iv) as copper contains 29 protons and 29 electrons.
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