~The picture below shall help :)
-Hope this helped ^_^
Answer:
you can see the answer at the pic
Atomic number shows the number of protons in an atom's nucleus. If the atomic number is 30, then it has 30 protons. The question says it is neutral, so it must have the same amount of protons and electrons.
A is the correct answer based on this.
Answer:
138.19388999999998 grams of silicon dioxide
