18 months - normal or not?

My son is 18 months old, and does the following:

- Throws tantrums left, right and centre.

- Picks up EVERYTHING and puts it in his mouth (never swallows, just runs away, laughing as I try to get it off him).

- Touches things he knows he’s not supposed to (goes from one thing to another).

- Looks at me and grins when he’s about to touch something he’s not allowed to.

- Doesn’t care about getting a smack. Laughs it off and does wrong again.

- when I say no, he doesn’t listen.

- ignores me when I say his name.

- Chews food, spits it out or throws it.

Is this normal? How can I stop it?!

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