Classification of Elements

1 Marks Question

1. State the law of modern periodic table.
2. The law of the modern periodic table states that the physical and chemical properties of elements are periodic functions of their atomic number.
3. Write the position of lanthanides in the periodic table.
4. The position of lanthanides in the periodic table is in 'f' block, group IIIB (13) and 6^th period.
5. State the law of Mendeleev's periodic table.
6. The law of Mendeleev's periodic table states that the physical and chemical properties of elements are periodic functions of their atomic weight.
7. Write the electronic configuration of potassium in terms of sub-shell.
8. The electronic configuration of potassium in terms of sub-shell is:
   1s²2s²2p⁶3s²3p⁶4s¹
9. What is P-block element?
10. The element whose last electron enters into p-orbital is called p-block element.
11. What is the name of elements of atomic number ranges from 58 to 71?
12. The name of elements of atomic number ranges from 58 to 71 is lanthanide elements.
13. In which group of modern periodic table alkaline earth metal and halogen are kept?
14. Alkaline earth metal are kept in group IIA (2) and halogen are kept in group VIIA (17) of modern periodic table.
15. In which groups of modern periodic table do alkali metals and inert gas lie?
16. Alkali metals lie in group IA and inert gas lie in group VIIIA of modern periodic table.
17. What are the maximum number of electrons that can accommodate in p and f sub-shell?
18. The maximum number of electrons that can accommodate in p and f sub-shell are 6 and 4 respectively.
19. Write electronic configuration of calcium on the basis of sub-shell.
20. Electronic configuration of calcium on the basis of sub-shell is:
    1s²2s²2p⁶3s²3p⁶4s²
21. What is periodic table?
22. The table so formed by the arrangement of elements on the basis of their similar and dissimilar properties is called periodic table.
23. Write the electronic configuration of Aluminum and Potassium in terms of sub-shell.
24. Aluminum = 1s²2s²2p⁶3s²3p¹
    Potassium = 1s²2s²2p⁶3s²3p⁶4s¹
25. What is transition element?
26. The elements which are arranged between group IIA and IIIA (d-block) in the modern periodic table is called transition element.
27. In what group do magnesium and nitrogen belong in modern periodic table?
28. Magnesium lie in group 2 (IIA) and nitrogen lie in group 15 (VA) in modern periodic table.
29. What is modern periodic table?
30. The table in which elements are arranged in the increasing order of their atomic number and have 18 groups and 7 periods is called modern periodic table.