Chemistry

Question Analysis
This question involves linking atomic number to element identity, calculating mass number from protons/neutrons, and naming the isotope correctly.
The main focus is on integrating periodic table knowledge (atomic number → element) with mass number calculation (protons + neutrons).

Key Concept Explanation
Atomic number = number of protons = 26 → element = iron (Fe, periodic table; nickel = atomic number 28).
Mass number = protons + neutrons = 26 + 30 = 56.
Isotope name = element name + mass number → iron-56; nuclear notation = =

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