Answer :
Option (a) is correct. The number of protons makes an element distinct.
The atomic number of an element is determined by its number of protons in the nucleus of an atom. Each element has a unique number that identifies how many protons are in one atom of that element. The atomic number of an element never changes meaning that the number of protons in the nucleus of every atom in an element is always the same. The periodic table is organized based on the atomic number of each element, which is located in the top left corner of each element box in the table below. The atomic number is the number of protons in the nucleus of an atom of that element. The atomic mass is also listed for each element below under its name.
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