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No.12) or Cl (At. No. 17) (b) Na (At. No. 11) or K (At. No. 19) 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Consider the following elements : 20Ca, 8O, 18Ar, 16S, 4Be, 2He Which of the above elements would you expect to be: (i) very stable? (ii) in group 2 of the periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh An atom has an electron structure of 2, 7. (a) What is the atomic number of this atom? (b) To which of the following would it be chemically similar? 7N, 15P, 17Cl, is Ar (c) Why would you expect it to be similar? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is a group in the periodic table? In which part of a group would you separately expect the elements to have (i) the greatest metallic character (ii) the largest atomic size? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Explain why, the first period of the modern periodic table has only two elements whereas second period has eight elements. (b) Why do elements in the same group show similar properties but the elements in different groups show different properties? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What are the periods and groups in a periodic table? Give two characteristics of each. (b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71? (b) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table? (b) Helium and neon are unreactive gases. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this w... 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way? (b) Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements? (b) What is the number of elements in: (a) 1st period, and (b) 3rd period, of the modern periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What are the usual number of valence electrons and valency of group 18 elements of the periodic table? (b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is the fundamental difference in the electronic configurations between the group 1 and group 2 elements? (b) On the basis of electronic configuration, how will you identify: (i) chemically similar elements? (ii) the first element of a period? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh How does the electropositive character of elements change on going down in a group of the periodic table? (b) State how the valency of elements varies (i) in a group, and (ii) in a period, of the periodic table. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Explain why: (i) All the elements of a group have similar chemical properties. (ii) All the elements of a period have different chemical properties. (b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way? (b) What happens to the metallic character of the elements as we move from left to right in a period of... 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right? (b) How do the following change on going from left to right in a period of the periodic tab... 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table: (a) What is the number of valence electrons in X? (b) What is the valency of X? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configurations of these two elements. Which of these will be more electronegative? Why? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Page 2 / 5 Prev 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? Δ Home About Us Contact Us Privacy Policy Term of Use Copyright © 2020 Eanshub All Rights Reserved
