What is the approximate radius of the n = 1orbit of gold ( z
=19 )?

Explanation:

Let r is the radius of the n = 1 orbit of the gold. According to Bohr's model, the radius of orbit is given by :

Where

n = number of orbit

h = Planck's constant

Z = atomic number (for gold, Z = 79)

m = mass of electron

e = charge on electron

So, the radius of the n = 1 orbit of gold is . Hence, this is the required solution.

at right angles to each other