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Being a big fan of 'Here Comes Science', the lyrics of 'Meet The Elements' is no stranger to Austin. In fact, he had picked every lines of the lyrics by heart.

As Austin learned the fact that 'iron is a metal, you see it every day', he started to observe the examples around him. He also likes to play with a digital timer that is attached with a piece of magnet. When he placed the timer on fork or spoon, it is attracted to it but not other metal surface such stainless steel mug. Hence, he noticed that not all metals are attracted to magnet, but iron does, as it is magnetic.
IronForKids 
And here comes the tricky question.

Daddy: Austin, we needs to eat vegetables because it has lots of minerals like magnesium, iron and potassium.
Austin: Why fork has iron, it can't (be) bent? Why vegetables has iron, and it can (be) bent?
Daddy: Mommy is a chemist (by training). She can explain to you better!
Mommy: Oh yeah!!..

And mommy began to scratch her head to figure out.

Referring to the fork, a substantial was made of iron. Iron in its original form are in lattice shape, held together by strong, static bonds. It is called metallic bonding. In vegetables, iron mostly exists the form of ionic compound. Most of the times, iron are joined with other ionic compound, appearing as a large molecule. Their bonding is weaker, therefore can be easily broken. (BTW, I doubt he understood completely. I was equally confused when my chemistry explained this for the first time!)

I am still trying to figure how to show Austin the different between metallic bonding and ionic bonding with a simple experiment. Anyone who is interested to share?