An element has an atomic mass number of 16 and an atomic number of 7. how many protons and neutrons does the element have?

Nitrogen, hope this helps

The atomic number = number of protons = number of electrons.
The atomic mass - the atomic number = number of neutrons.
Protons - 7
Electrons - 7
Neutrons - 9
Element - Nitrogen
Hope this helps, good luck!

Long term continuous groundwater monitoring, especially with warning systems and anthropic activity monitors