Answer the following question given this paragraph: 

In the modern periodic table, each element is represented by its chemical symbol. The number above each symbol is its atomic number. Atomic numbers increase from left to right and from top to bottom in the table.


Q: What is denoted by the number above the chemical symbol of each element in a modern periodic table?

 Choices:

- metallic number

- atomic weight

- electron count

- atomic number

A:
atomic number
