The electronic configuration of an element is 1s^2 2s^2 2p^6. hkw many valence electrons does it have

It has 8 valence electrons.

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.