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  4. A nucleus represented by the symbol ZXA has:

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Q. A nucleus represented by the symbol $_{Z}X^{A}$ has:

J & K CETJ & K CET 2001

Solution:

In the symbol $ _{Z}{{X}^{A}}, $ A gives the mass number (sum of neutrons and protons) and $Z$ the atomic number (protons). Therefore, number of neutrons $ =A-Z $ .