Ans: 4) Sulfur
In general for a given element:
The atomic number (Z) = number of protons
The atomic mass (A) = number of protons + number of neutrons
Atomic number Z of Neon, Ne = 10
Atomic number Z of oxygen, O = 8
Atomic number Z of sodium, Na = 11
Atomic number Z of sulfur, S = 16
Hence, sulfur is the element with 16 protons.
