Periodic Classification of Elements Questions
Periodic Classification of Elements Questions
Que 1. What is the correct order of relative basic character of NaOH, Mg(OH)2, and Al(OH)3?
Que 2. An element has the atomic number 16. To which group and period does it belong?
Que 3. Can the following groups of elements be classified as Dobereiner’s triad?
i) Na, Si, Cl
ii) Be, Mg, Ca Atomic mass of Be – 9, Na – 23, Mg – 24, Si – 28, Cl – 35, Ca – 40. Give justification for your Answer.
Que 4. What was the basis of the classification of elements by Newland?
Que 5. What type of oxide would Eka– aluminium form?
Que 6. Considering elements B, AI, Mg, and K, write the correct order of their metallic character.
Que 7. Out of Li and K, which will have a stronger metallic character and why?
Que 8. Write the limitations of Mendeleev’s periodic table.
Que 9. An element ‘X’ has mass number 35 and 18 number of neutrons. Therefore, the Electronic configuration of X= 2, 8, 7. Write the atomic number and electronic configuration of ‘X’. Also write the group number, period number, and valency of ‘X’.
Que 10. How does the electronic configuration of an atom of an element relate to its position in the modern periodic table? Explain with one example.
Que 11. The electronic configuration of an element ‘X’ is 2, 8, 6. To which group and period of the modern periodic table does ‘X’ belong? State its valency and justify your answer in each case.
Que 12. List the anomalies of Mendeleev’s periodic table removed in the Modem Periodic Table.
Que 13. How the electronic configuration of the atom of an element is related to its position in the modern periodic table? Explain with one example.
Que 14. An element X (atomic number = 17) reacts with an element Y (atomic number = 20) to form a divalent halide.
(a) Where in the periodic table are elements X and Y placed?
(b) Classify X and Y metals, non-metals, or metalloids?
(c) What will be the Nature of the oxide of element Y?
(d) Draw the electron dot structure of the divalent halide.
Que 15. (i) Why do we classify elements?
(ii) What are the two criteria used in the development of the Modern Periodic Table?
(iii) State the position of (a) metals, (b) non-metals, and (c) metalloids in the periodic table.
(iv) Would you place two isotopes of chlorine; Cl – 35 and Cl – 37 in different slots of the periodic table because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Que 16. An element ‘X’ is forming an acidic oxide. Its position in the modern periodic table will be
(a) Group 1 and Period 3
(b) Group 2 and Period 3
(c) Group 13 and Period 3
(d) Group 16 and Period 3
Que 17. Which atom is most electronegative in period 4?
(a) K
(b) Rb
(c) Sr
(d) Ca
Que 18. Using the given part of the periodic table, answer the questions given below:
| Group → Period ↓ | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| 3 | X | B | C | D | E | |||
| 4 | Y | |||||||
| 5 | Z |
(A). Which of these elements have the smallest atomic size?
(a) B
(b) C
(c) D
(d) E
(B) What is the valency of element E?
(a) 1
(b) 3
(c) 2
(d) 0
(C) Identify the elements which have similar chemical properties as the element X.
(a) Y and Z.
(b) Y and B
(c) All Y, Z, and B
(d) None of these
(D) Which of them will have the largest atomic radii?
(a) E
(b) X
(c) C
(d) D
Que 19. An element ‘X’ with atomic number 11 forms a compound with an element ‘Y’ with an atomic number 8. The formula of the compound formed is
(a) XY
(b) X2Y
(c) XY2
(d) X2Y3
Que 20. Which of the following is the outermost shell for elements of period 2?
(a) K shell
(b) L shell
(c) M shell
(d) N shell
Assertion Reason
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is NOT the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is true.
Que 21. Assertion (A): Mendeleev left the gaps under aluminium and silicon and called these Eka-aluminium and Eka-silicon, respectively.
Reason (R): Dobereiner arranged elements on the basis of increasing atomic number.
Que 22. Assertion (A): Sixth and seventh periods in the periodic table contain 14 elements.
Reason (R): In the periodic table, 14 elements of the sixth and seventh periods are known as lanthanoids and actinoids.
Que 23. Assertion (A): Noble gases are highly reactive.
Reason (R): Noble gases have stable closed-shell electronic configurations.
Que 24. Assertion (A): Be and Al show some similar properties.
Reason (R): The metallic radius of Be is less than the metallic radius of Al.
Que 25. Assertion (A): Sixth and seventh periods in the periodic table contain 14 elements.
Reason (R): In the periodic table, 14 elements of the sixth and seventh periods are known as lanthanoids and actinoids respectively.
Periodic Classification of Elements Questions
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