Flexi Says: The statement of helium is more reactive than magnesium is false. This is because helium electronic configuration is 1s2 indicating that its valence shell is completely filled and is very close to the nucleus due to which it is very difficult to remove electrons from the shell to oxidize helium. However, magnesium electronic configuration is 1s2 2s2 2p6 3s2 indicating that its valence shell is away from the nucleus and thus electrons present in this shell are less attracted towards the nucleus due to which it is comparatively easier to remove electrons from its valence shell.
