What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleev’s Periodic Law.
The chemical property he used was the nature of oxide and hydride formed i.e. similarity in chemical properties were used by him. The two observations that posed a challenge in Mendeleev periodic law were: Arranging elements according to the increasing order of their atomic masses could not be maintained.
Mendeleev arranged the elements on the basis of their atomic mass. Melting and boiling point were used as the physical characteristics in deciding the position of elements. He arranged the elements and wrote the formula of their oxides and hydrides which seemed to possess same chemical formula.
The observations which posed a challenge to Mendeleev periodic table are ; - Position of hydrogen in the first group among metal though it is non-metal. - Placing the elements with higher Atomic mass before the elements with lower Atomic mass. - No places were left in between two groups for isotopes
Answers & Comments
Answer:
The chemical property he used was the nature of oxide and hydride formed i.e. similarity in chemical properties were used by him. The two observations that posed a challenge in Mendeleev periodic law were: Arranging elements according to the increasing order of their atomic masses could not be maintained.
Explanation:
hope it helps you
Verified answer
Mendeleev arranged the elements on the basis of their atomic mass. Melting and boiling point were used as the physical characteristics in deciding the position of elements. He arranged the elements and wrote the formula of their oxides and hydrides which seemed to possess same chemical formula.
The observations which posed a challenge to Mendeleev periodic table are ; - Position of hydrogen in the first group among metal though it is non-metal. - Placing the elements with higher Atomic mass before the elements with lower Atomic mass. - No places were left in between two groups for isotopes
hope it's help you