Classification of Elements and Periodicity in Properties Set-1

Q1. What physical property did Henry Moseley, in 1913, correlate with the characteristic X-ray spectra of elements to prove that atomic number ($Z$) is a more fundamental property than atomic mass?

Q2. Which chemist noted a similarity among the physical and chemical properties of groups of three elements, known as triads, in the early 1800s?

Q3. Mendeleev's Periodic Law stated that the properties of the elements are a periodic function of their:

Q4. John Alexander Newlands profounded the Law of Octaves in 1865. This law suggested that every eighth element had properties similar to the first element when arranged by increasing order of:

Q5. Which elements, in addition to actinium and protoactinium, were found in pitchblende, an ore of uranium, stimulating renewed interest in Inorganic Chemistry?

Q6. The Modern Periodic Law, which modified Mendeleev’s law, states that the physical and chemical properties of the elements are periodic functions of their:

Q7. The horizontal rows in the Modern Periodic Table are known as:

Q8. According to the recommendation of the International Union of Pure and Applied Chemistry (IUPAC), how are the vertical columns (groups) in the Modern Periodic Table numbered?

Q9. The element Iodine ($\text{I}$) has a lower atomic weight than Tellurium ($\text{Te}$). Mendeleev ignored the order of atomic weights and placed Iodine in Group VII along with Fluorine and Chlorine. This decision was based on:

Q10. What property did Mendeleev predict for Eka-silicon (later Germanium) regarding the formula of its oxide?