Answer:
Oxygen
Step-by-step explanation:
Oxygen has 8 protons, electrons, and neutrons.
In the periodic table, it appears that it has a relative atomic mass of 16, an atomic number of 8 and it is in group 6 period 2.
The relative atomic mass is the mixture of protons plus neutrons.
The atomic number is the number of protons (and the same number of electrons).