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Problem: According to Bohr's model of the hydrogen atom, calculate the radius of the second orbit (n = 2). Use the formula r = 0.529 * (n^2 / Z) Angstroms, where Z is the atomic number of hydrogen. Step 1: Identify the given values from the problem statement. For hydrogen, the atomic number Z = 1. The target orbit number given is n = 2. Step 2: Substitute the values of n and Z into Bohr's radius formula: r = 0.529 * (2^2 / 1). Step 3: Calculate the square of the orbit number: 2 squared equals 4. Step 4: Multiply 0.529 by 4, which gives 2.116. Step 5: Write down the final unit. The calculated radius is 2.116 Angstroms.