Using the Bohr model, find the first three energy levels for a He²⁺ ion, which consists of two protons in the nucleus with a single electron orbiting it. What are the radii and electron velocity of the first three orbits?

a) 0.53 Å, 2.19 × 10⁶ m/s
b) 0.53 Å, 4.38 × 10⁶ m/s
c) 2.12 Å, 2.19 × 10⁶ m/s
d) 2.12 Å, 4.38 × 10⁶ m/s