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Q.

In Ra 226 88  nucleus, there are

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a

138 protons and 88 neutrons

b

138 neutrons and 88 protons

c

226 protons and 88 electrons

d

226 neutrons and 138 electrons

answer is B.

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Detailed Solution

XA z =88Ra226Number of protons = Z = 88Number of neutrons=A−Z=226−88=138.
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