Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons
equal number of nucleons

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more

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