Question

B) Explain two criteria's which were used by Mendeleev to classify elements?
C)Carbon has two isotopes, where are these placed in the Modern Periodic Table?​ Please answer !!​

Answer 1

Answer:

B). 1. The elements were arranged around to their increasing atomic masses,

2. He grouped elements having similar properties together.

C). Isotopes have the same atomic number, similar chemical properties but different atomic masses. Based on the periodic law, an isotope is an element, which must have a separate place in the periodic table. However, there are no places for isotopes in his periodic table.