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Chapter 29: Problem 5

Write the symbol (in the form \(_{Z}^{A} \mathrm{X}\) ) for the isotope of potassium with 21 neutrons.

Short Answer

Expert verified
Answer: The symbol for a potassium isotope with 21 neutrons is $_{19}^{40} \mathrm{K}$.

Step by step solution

01

Find the element symbol and atomic number of potassium

Look up potassium in the periodic table and see that its element symbol is K, and its atomic number (Z) is 19, denoting 19 protons.
02

Determine the mass number (A)

The mass number (A) is the sum of protons and neutrons in the nucleus. Since potassium has 19 protons and 21 neutrons are present in this specific isotope, the mass number (A) can be calculated as: A = Protons + Neutrons = 19 + 21 = 40.
03

Write the symbol for the isotope

Now that we have the atomic number (Z) and mass number (A) for this potassium isotope, we can write the symbol in the \(_{Z}^{A} \mathrm{X}\) format, resulting in: \(_{19}^{40} \mathrm{K}\).

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