What is the number of protons in a nucleus of an element?
In chemistry, we use the periodic table quite a bit. On the periodic table you can decide whether it's a metal, metalloid or nonmetal (excluding transition metals). You can also gather information on the average molar mass (atomic mass) and the atomic number of a specific element. Much more can be taken from the table but these of some of the many examples.
Antimony is number
Let's say Antimony loses one of those protons or electrons... Then the element becomes unstable and will react to gain or lose the desired atom it requires. If the element is stable, then no change is necessary.
Protons and neutrons are found in the nucleus. Electrons are not. Just throwing that out there.
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The number of protons in the nucleus of an atom is its atomic number, which is unique to each element. The number of protons identifies an element and determines its chemical properties. The elements are arranged in order of increasing atomic number on the periodic table.
The atomic number of an atom never changes in a chemical reaction, but can change during radioactive decay. In a neutral atom, the number of electrons equals the number of protons. Isotopes of the same element differ in the number neutrons in the nucleus, but never differ in the number of protons.