Question

Consider the following statements.

I. In Mendeleev's periodic table, position of the isotopes was not fixed.

II. In the 19th century, Mendeleev propounded periodic law is based on atomic mass.

Which of the above statement(s) is/are correct?

(a) Only I

(b) Only II

(c) Both I and II

(d) Neither of them

Answer 1

(c) Both I and II

Mendeleev's Periodic Table:

1. A Russian scientist named Dmitri Mendeleev presented a paper on the Law of Octaves in 1869, just five years after John Newlands first proposed it.

2. Mendeleev stated that "Element characteristics are a periodic function of their atomic weight" in his renowned periodic law.

3. The Periodic Table of Mendeleev is a table that Mendeleev created to list elements in the order of their atomic weights.

4. Isotopes of an element must be given distinct locations in the periodic table because they have various atomic masses, according to Mendeleev's Periodic Law.

5. Because Mendeleev's periodic chart was structured in increasing order of atomic number, which is not how isotopes are arranged, and because isotopes share the same atomic number, no one isotope can fit into a single box in the periodic table.