Imagine a scientist is analyzing an unknown atom and finds it has a mass number of 24 and an atomic number of 12. If the atom gains two neutrons due to a nuclear reaction, what will be its new mass number?
26
Mass number = protons + neutrons. With mass number 24 and atomic number 12, the atom has 12 protons and 12 neutrons.
Gaining two neutrons raises the neutron count to 14 while the protons stay at 12.
New mass number = 12 + 14 = 26.
Hence, the answer is 26.
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