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Q.

The mass number and the atomic number of an element are 192 and 77 respectively. Find the number of protons in an atom of the same element.

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a

269

b

192

c

77

d

115

answer is A.

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Detailed Solution

detailed_solution_thumbnail

An atom contains an equal number of electrons and protons, which are equal to the atomic number of the element.

Thus, the number of protons present in an atom of the given element is 77.

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