Question

the periodic table organizes the 118 known chemical elements. which property is used to arrange these elements in the table?
a atomic number, which is equal to the number of protons in an atom
b atomic mass, which is equal to the number of electrons in an atom
c nucleus radius in reptometers
d chemical symbol in alphabetical order

Explanation:

Elements in periodic table are arranged by atomic number, which is number of protons.

Answer:

A. atomic number, which is equal to the number of protons in an atom