Periodic classification is a remarkable technique to classify elements in different classes based on their properties. Elements were classified into distinct groups based on their atomic numbers. The horizontal rows of the periodic table were classified as periods, while the vertical columns were classified as groups. There are eighteen groups and seven periods in the modern periodic table.
Download Class 10 Chemistry Worksheet on Chapter 5 Periodic Classification of Elements Set 2 PDF
CBSE Class 10 Chemistry Chapter 5 Periodic Classification of Elements Worksheet – Set 2
Q1. Newlands relation is also known as
(a) Law of an octave
(b) Atomic mass law
(c ) Both (a) and (b)
(d) None of the above
Q2. The Law of an octave is valid up to which of the following element?
(a) Calcium
(b) Cobalt
(c ) Both (a) and (b)
(d) None of the above
Q3. Which of the following element was discovered after the discovery of Mendeleev’s periodic table?
(a) Helium
(b) Germanium
(c ) Both (a) and (b)
(d) None of the above
Q4. How many elements were uncovered during the discovery of Mendeleev’s periodic table?
(a) Sixty-one
(b) Sixty-three
(c ) Both (a) and (b)
(d) None of the above
Q5. Which of the following element is known as eka-aluminium?
(a) Germanium
(b) Gallium
(c ) Indium
(d) None of the above
Q6. What is the foundation for categorising elements in the modern periodic table?
Q7. A metal X is in the 1st group of the modern periodic table. What will be the valency of metal X?
Q8. Among Lithium, Carbon and Nitrogen, which element will have the most basic oxide and acidic oxide?
Q9. Originally, it was acknowledged that the atomic mass of beryllium was 13. But Mendeleev proposed that its atomic mass should be 9.
(i) Was Mendeleev’s suggestion accurate?
(ii) How had he acquired this judgment?
Q10. An element X is in the second period and group 15 of the modern periodic table. What is
(i) The number of valence electrons.
(ii) Valency.
Q11. Identify the similarity in the elements given below:
(i) Sodium and Potassium
(ii) Boron and Carbon
Q12. How do the atomic size in a group and a period of the modem periodic table change?
Q13. An atom X has an electronic configuration of 2, 8, 6.
(i) What is the atomic number of X?
(ii) Name the element that is similar to it.
Q14. Metallic character of elements A, B, C and D are in the order D > A > C > B.
(i) What is the order of their electronegative character?
(i) What is the nature of B oxide if the oxide of A is amphoteric?
Q15. Write the reason for the following
(i) Lithium and sodium are considered active metals.
(ii) Fluorine is more reactive than chlorine.
Q16. The elements of the second and third periods of the periodic table are presented below.
| Li | Be | B | C | N | O | F |
|---|---|---|---|---|---|---|
| Na | Mg | Al | Si | P | S | Cl |
(i) Which atom is bigger, Lithium or Beryllium? Give a reason for your answer.
(ii) Which of the following is most metallic? Give a reason for your answer.
Q17. The atomic number of elements A, B, C, D and E are given below.
| Element | A | B | C | D | E |
|---|---|---|---|---|---|
| Atomic Number | 7 | 10 | 12 | 4 | 19 |
From the above table, answer the following questions.
(i) Which two elements are chemically alike?
(ii) Which element is inert?
Q18. What is a valence electron? Does the number of valence electrons increase or decrease on moving from left to right in a period.
Q19. How does the valency of elements vary in the period?
Q20. The atomic number of elements A, B and C are 11, 14 and 17, respectively.
(i) Articulate the group to which these elements belong in the modern periodic table.
(ii) Write the formula of the compound formed when the elements B reacts with C.
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Read Also:
- Periodic Classification Of Elements
- Classification of Elements and Periodicity in Properties
- Periodic Table
- Modern Periodic Table And Its Significance
- Periodic Properties Of Elements and Their Significance
- Modern Periodic Law
- Periodic Table of Elements
- Chemistry Concept Questions and Answers
- Newland’s Law of Octaves and Dobereiner’s Triads
- Classification of Elements and Periodicity in Properties
- Mendeleev Periodic Table
- Class 10 Chemistry Chapter 5 – Periodic Classification of Elements Important Questions with Answers
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