Question

Which of the following elements is inert, meaning it is not reactive?

Cesium

  Gold  
Iodine

 
Xenon

Thanks!

Answer 1

Xenon

Step-by-step explanation:

Xenon has 8 valence electrons, and when an element has 8 valence electrons, they are non-reactive. 8 is the "happy" number!

Answer 2

It's Xenon because it barely ever reacts and is considered an inert element.