Homework Answers
Given iron atom has 30 neutrons (n) and 26 protons (p). As it is neutral, there will be 26 electrons to neutralize the charge of 26 protons.
Now, number of proton indicates the atomic number of an element, so atomic number of iron is 26.
Again, the mass number of an atom = no. of protons + no. of neutrons = p + n = 26+30 = 56. So mass number of iron atom is 56.
Therefore option (b) is correct.
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