Question: How many protons are in the nucleus of one atom of neon based on this information found in the Periodic Table?

10

Ne

Neon

20.18

Answer: 10

Question: Why is oxygen an element?

Answer: It cannot be broken down into a simpler substance through chemical means.

Question: How do elements form?

Answer: through fusion in stars and supernova

Question: What is the expression of the chemical composition of a compound?

Answer: chemical formula

Question: What is the chemical formula for ammonia, according to this illustration?

Answer: NH₃