Q. 34.5( 77 Votes )

How many neutrons and protons are there in the following nuclei?


Answer :

Suppose for element X with following representation

zXA


Where A = Mass Number of Element and Z = Atomic Number of the element.


(i) 6C13


Mass Number of Carbon, A = 13


Atomic Number of Carbon, Z = 6


Number of protons = Number of Electrons = Atomic Number =6


Number of neutrons = A – Z


= 13-6 = 7


(ii) 8O16


Mass Number of Oxygen, A = 16


Atomic Number of Oxygen, Z = 8


Number of protons = Number of Electrons = Atomic Number =8


Number of neutrons = A – Z


= 16-8= 8


(iii) 12Mg24


Mass Number of Magnesium, A = 24


Atomic Number of Magnesium, Z = 12


Number of protons = Number of Electrons = Atomic Number =12


Number of neutrons = A – Z


= 24-12 = 12


(iv) 26Fe56


Mass Number of Iron, A = 56


Atomic Number of Iron, Z = 26


Number of protons = Number of Electrons = Atomic Number = 26


Number of neutrons = A – Z


= 56-26 = 30


(v) 38Sr88


Mass Number of Strontium, A = 56


Atomic Number of Strontium, Z = 26


Number of protons = Number of Electrons = Atomic Number = 38


Number of neutrons = A – Z


= 88-38= 50

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