Answer:
Based on the periodic law
Explanation:
All the elements on the periodic table were constructed based on the periodic law.
Henry Moseley in the 1900s re-stated the periodic law by changing the basis of the law from atomic weight to atomic number. The present periodic law is therefore "the properties of elements are a periodic function of their atomic number".
- The atomic number is the number of protons in an atom.
- Based on the graduation of atomic number on the periodic table, elements are classified into groups and periods.
