What were the main demerits of Mendeleev’s periodic table? (i) Hydrogen has been placed…
Chemistry · Class 11 · CBSE — Classification of Elements and Periodicity in Properties
What were the main demerits of Mendeleev’s periodic table?
(i) Hydrogen has been placed in group I though it resembled to group VII as well.
(ii) Position of some elements was not justified.
(iii) Isotopes were not given separate places.
(iv) Lanthanides and actinides were not included in the table.
(i) Hydrogen has been placed in group I though it resembled to group VII as well.
(ii) Position of some elements was not justified.
(iii) Isotopes were not given separate places.
(iv) Lanthanides and actinides were not included in the table.
- (i), (ii) and (iii)
- (i), (ii), (iii) and (iv)
- (ii) and (iv)
- (i), (iii) and (iv)
Answer
(B) (i), (ii), (iii) and (iv)
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- Which block of the periodic table contains elements with the general electronic configuration ( n – 2) f 1–14…
- Which of the following halides is most easily oxidised?
- What is common between given cations and anions, O 2– , F – , Na + , Mg 2+ , Al 3+ ?
- Few elements are matched with their successive ionisation energies. Identify the elements. Element IE 1…
- An element X has atomic number 19. What will be the formula of its oxide?
- What is the atomic number of the element which has 3 d 6 as its outermost configuration?
- Which of the following have the same number of electrons in outermost shell?
- A sudden large jump between the values of second and third ionization energies of an element would be…
More Classification of Elements and Periodicity in Properties questions · Browse all practice questions