SCIENCE AND TECHNOLOGY

STANDARD TEN
PART I & II
CHAPTER : 1
Periodic Classification of Elements

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SCIENCE AND TECHNOLOGY – Chapter 1

Periodic Classification of Elements

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1. How many periods and groups are present in the periodic table?

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2. Which of the following forms the basis of the modern periodic table?

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3. What happens to the electropositive character of elements on moving from left to right in a periodic table?

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4. The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in

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5. Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?

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6. What is the other name for group 18th elements?

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7. Which of the following is the most reactive element of the group 17?

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8. Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as

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9. Which group elements are called transition metals?

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10. Which of the following elements has 2 shells and both are completely filled?

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11. Which of the following is the atomic number of an element that forms basic oxide?

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12. The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds?

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13. Which of the following does not decrease while moving down the group of the periodic table?

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14. An element X belongs to the 3rd period and 1st group of the periodic table. What is the number of valence electrons in its atom?

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15. An element M is in group 13th of the periodic table, the formula for its oxide is

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