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Q.

The nucleus of the element having atomic number 25 and atomic weight 55 will contain

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a

25 protons and 30 neutrons

b

25 neutrons and 30 protons

c

55 protons

d

55 neutrons

answer is A.

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Detailed Solution

No. of protons = Atomic no. = 25 and no. of neutrons = mass no - atomic no = 55 -25 = 30.

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The nucleus of the element having atomic number 25 and atomic weight 55 will contain