STANDARD TEN PART I & II CHAPTER : 1 Periodic Classification of Elements /15 0 votes, 0 avg 4185 SCIENCE AND TECHNOLOGY – Chapter 1 Periodic Classification of Elements 1 / 15 1. How many periods and groups are present in the periodic table? 7 periods and 18 groups 8 periods and 7 groups 7 periods and 7 groups 8 periods and 8 groups 2 / 15 2. Which of the following forms the basis of the modern periodic table? Atomic mass Atomic number Number of nucleons All of these 3 / 15 3. What happens to the electropositive character of elements on moving from left to right in a periodic table? Increase Decreases First increases than decreases First decreases than increases 4 / 15 4. The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in 4th group 2nd group 14th group 18th group 5 / 15 5. Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen? O < F < N N < F < O O < N < F F < O < N 6 / 15 6. What is the other name for group 18th elements? Noble gases Alkali metals Alkali earth metals Halogens 7 / 15 7. Which of the following is the most reactive element of the group 17? Oxygen Sodium Fluorine Magnesium 8 / 15 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 Na Mg Al Si 9 / 15 9. Which group elements are called transition metals? Group number 1 to 2 Group number 13 to 18 Group number 3 to 12 Group number 1 to 8 10 / 15 10. Which of the following elements has 2 shells and both are completely filled? Helium Neon Calcium Boron 11 / 15 11. Which of the following is the atomic number of an element that forms basic oxide? 18 17 19 15 12 / 15 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? A and B B and C C and A None of these 13 / 15 13. Which of the following does not decrease while moving down the group of the periodic table? Atomic radius Metallic character Number of shells in the atom Valence electrons 14 / 15 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? 1 3 6 8 15 / 15 15. An element M is in group 13th of the periodic table, the formula for its oxide is MO M2O3 M3O2 None of these Your score is 0% Restart quiz