Question

Please can anyone help me? How are the first 20 elements of the periodic table constructed?​

Answer 1

Based on the periodic law

Step-by-step 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.