What does the atomic number tell you

Explanation:

The atomic number tells you how many protons are in an element. Each element has a different number of protons, so a specific number of protons will also help you easily identify that particular element. For example, if you are given that an element has an atomic number of 1, you would know the element is hydrogen because other elements have different amounts of protons and thus different atomic numbers.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it