CBSE Worksheet for chapter-5 Periodic Table class 10

Worksheet For class 10

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Summary

Introduction.

Q1. Early attempts to classify –

1. Dobereiner’s law of triads and its drawbacks.
2. Newlands law of octaves and its drawbacks.
3. Lothar Meyer curve and its drawbacks.
4. Mendeleev’s classification and its drawbacks.

Q2. Modern periodic law and its drawbacks.

Salient features of modern periodic table-

1. Groups and periods.
2. Blocks.
3. Representative, transition and inner-transition elements.

Q3. Periodicity in properties (group wise and period wise)

1. Atomic size.
2. Valance electrons and valency.
3. Metallic and non-metallic character.
4. Chemical reactivity.
5. Ionization energy.
6. Electronegativity.

Section - 1

Q1. An element with atomic number 17 is 

1. Rare gas
2. A halogen gas
3. An alkali metal
4. A transition element

Q2. Which of the following pairs of elements does not belong to same group ?

1. Cl, Br
2. N, P
3. Mg, Ca
4. Al, Si

Q3. Which of the following is smallest in size ?

1. Na⁺
2. Ne
3. Mg⁺²
4. All have small size

Q4. Newland’s could classify elements only upto –

1. Copper
2. Chlorine
3. Calcium
4. Chromium

Q5. Cl, Br, I if this is a Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively, then the atomic masses of Br is –

1. 162.5
2. 91.5
3. 81.25
4. 45.625

Q6. In the long form of periodic table, lanthanides are placed in the –

• 2^nd period
• 5^th period
• 6^th period
• 7^th period

Q7. All the members in a group of long form of periodic table have the same –

1. Valency
2. Number of valence electrons
3. Chemical properties
4. All of these

Q8. Element M has an atomic number 12 and atomic mass 24. Its ion will be represented by –

1. M⁺
2. M^-
3. M²⁺
4. M^2-

Q9. Which of the following has the maximum non-metallic character ?

1. F
2. Cl
3. Br
4. I

Q10. On moving from top to bottom in a group , in the periodic table, valency –

1. Increases
2. Decreases
3. Remains same
4. First increases, then decreases

Section - 2

Q11. What were the major defects of Mendeleev’s classification ?

Q12. Name three electrons with single electron in their valence shell ?

Q13. Name the metals among first ten elements in the modern periodic table ?

Q14. Give the name and the electronic configuration of the second alkali metal ?

Q15. What is meant by periodicity in properties of elements with reference to the periodic table ?

1. Why do all the elements of same group have similar properties ?
2. How will the tendency to gain electrons change as we go from left to right across a period ? Explain.

Q16. The atomic number of an element is 16. Predict –

1. Its valency
2. Its group number
3. Period number
4. Name of the element
5. Whether it is metal or non-metal
6. Nature of the oxide formed

Q17. Write names of the following –

1. Halogen belonging to second period.
2. Alkali metal belonging to fourth period.
3. A noble gas having atomic number 18.
4. An element having atomic number 8.
5. A element whose atom has electronic configuration 2, 8, 2.
6. Element with highest electronegativity.