The image above shows a table, which consists of half section the Mendeleev's Periodic Table. Among chemical properties, Mendeleev treated formulae of hydrides and oxides as one of the basic criteria for categorization. He took 63 cards and on each card, he wrote the properties of one element. He grouped the elements with similar properties and pinned it on the wall. He observed that elements were arranged in the increasing order of atomic mass and there was the periodic occurrence of elements with similar properties. According to this observation, he formulated a periodic law which states. "the properties of elements are the periodic function of their atomic masses." At last, this table was replaced by Modern Periodic Table.
1. Name elements whose atomic masses were corrected on the basis of their position in Mendeleev's periodic table.
a. Beryllium
b. Gold
c. Platinum
d. All the options
2. Whose formula were treated as one of the basic criteria for categorization by Mendeleev?
a. Hydrides
b. oxides
c. Halides
d. Both option 1 and 2
3. Choose correct option for a neutral atom.
a. number of electrons is equal to the number of neutrons
b. number of electrons is equal to the number of protons
c. number of neutrons is equal to the number of protons.
d. None
4. State demerits of Mendeleev Periodic Table.
a. Location of hydrogen in the periodic table
b. Irregularity in atomic mass
c. Both option 1 and 2
d. Gaps for the undiscovered elements
5. State merits of Mendeleev Periodic Table.
a. Location of hydrogen in the periodic table
b. Irregularity in atomic mass
c. Both option 1 and 2
d. Gaps for the undiscovered elements
