Periodic Classification Of Elements - Study Mode
[#66] Which of the following states that "the properties of elements are the periodic function of their atomic numbers".
Correct Answer
(A) Modern periodic law
[#67] In the modern periodic table, in which period elements with atomic numbers 19 to 36 are placed?
Correct Answer
(D) 4
[#68] The atomic number of actinium is-
Correct Answer
(A) 89
[#69] Which of the following statements are correct? 1. There are 18 elements in the fourth and fifth period. 2. The seventh period is incomplete with 33 elements. 3. The sixth period has 32 elements.
Correct Answer
(D) 1 and 3
[#70] Who was the first scientist to make periodic table of elements?
Correct Answer
(C) Mendeleev