11. According to Newlands' law of octaves, 'iron', which resembles . . . . . . . . and . . . . . . . . in properties, is kept far away from these elements-
12. In the fourth period of the periodic table . . . . . . . . elements are present?
13. The atomic number of lanthanum is?
14. Similar in elements of the same group in the modern periodic table have same . . . . . . . .
15. The second group of elements is called?
16. Which of the following is not a noble gas?
17. The volume of which atom is the lowest.
18. Which of the following radii reflect an increase in size of an atom?
19. According to Mendeleev's Periodic Law, elements were arranged on the basis of . . . . . . . . in the periodic table?
20. Groups of modern periodic table . . . . . . . . contains only 7 elements.
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