# Question #d7de9

##### 1 Answer

The minimum frequency needed is

The first thing you need to do is find out how much energy is required to ionize one magnesium atom. You do that by using **Avogadro's number** to go from moles to atoms

The relationship between energy and frequency is described by the *Planck-Einstein equation*, or

Since Planck's constant uses Joules, convert the value you have for the ionization energy of one atom from kJ to J

Now just plug this value into the Planck-Einstein equation