न्यूलैंड्स का अष्टक नियम केवल किस तत्व तक ही लागू होता था?

Which classification law of chemical elements was proposed by J.A.R. Newlands in 1865?

Match the group numbers with their corresponding element family names: i. III A (Group 13) ii. IV A (Group 14) iii. VI A (Group 16) iv. VII A (Group 17) a. Chalcogen family b. Halogen family c. Boron family d. Carbon family

Which German chemist in the early 1800s was the first to propose the concept of triads and trends among the properties of elements?

Match List-I (Symbol of Element) with List-II (Group/Classification of Element) and select the correct answer using the codes given below: List-I A. Sm B. Cs C. Os D. Np List-II1. Transition Elements2. Alkali Metals3. Actinoids4. Lanthanoids

Statement-I: The electronegativity order of F, O, N is F > O > N. Statement-II: The oxidation state of O in OF2 is +2 and in Na2O is -2. Choose the correct option:

An element 'X' is positioned in Group 2 and Period 6 of the Modern Periodic Table, and element 'Y' is placed in Group 3 and Period 6. Which of the following statements is/are true regarding X and Y? (a) Both X and Y are metals. (b) X is a metal and Y is a non-metal. (c) Y is more electropositive than X. (d) Both X and Y have the same number of valence electrons. (e) The atomic number of Y is greater than X.

Complete the given sequence by filling in the blanks: The atomic radius ________ in moving from left to right along a period. This is due to an ________ in nuclear charge due to which the size of the atom ________.

According to Newlands' Law of Octaves, the tenth element in the classification resembles which element?