Ans. The atomic radius of elements decreases along the period but Neon has highest size among III period element? 14.Give the properties of the oxides in a particular period. Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 3 - Classification of Elements and Periodicity in Properties prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. (ii)There were in all eight groups. Why. Whereas anion is formed by the gain of one or more electrons by the gaseous atom but the nuclear charge is same though the number of electrons has increased. Ans.Elements on two extremes of a period easily combines with oxygen to form oxides. NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. 15. Electronegativity is inversely related to the metallic properties of elements. What is the general outer electronic configuration of f – block elements? Most Important Question Of Chemistry Class 11 3. Ne is the only element in III period element which has Van der walls radius whereas the rest has covalent radius. Ans. Ans. Also Access CBSE Class 11 chemistry Sample Papers . The atomic size are generally expressed in terms of the following radii covalent radius, metallic radius and Van der waal’s radius. 23. CBSE Important Questions Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry. Ans. 10. 17. 18 groups in the long form periodic table. So, they must practice these CBSE Important Questions Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties to prepare effectively for the exam. First period contains 2 elements, 1H and 2 He and it is the shortest period. The atomic number of the element is 16. Get General Organic Chemistry important questions for Class 11 exams. The general electronic configuration of s – block elements is ns1-2. Important Questions for Class 12 Chemistry Chapter 3 Electrochemistry Class 12 Important Questions Electrochemistry Class 12 Important Questions Very Short Answer Type Question 1. Register online for Chemistry tuition on CoolGyan.Org to score more marks in your examination. Na and K have similar physical and chemical properties because they have same number of valence electrons. (b)  Which has the largest atomic radius? 8.Define ionization enthalpy and electron gain enthalpy? The electronic configuration of the element is 1s2 2s2 2p6 3s2 3p4. How does atomic size change in a group? The maximum chemical reactivity at the extreme left (among alkali metals) is exhibited due to the loss of an electron leading to the formation of a cation due to low ionization enthalpy and at the extreme right (among halogens) shown by the gain of an electron forming an anion. Similarly, the decrease in electronegativity down a group is accompanies by a decrease in non – metallic properties of elements. Students can find all type of questions such as short answer, long answer, match the following, assertion and reasoning. 2.Name the two elements whose existence and properties were predicted by Mendeleev though they did not exist then. These important questions are very helpful for every student for exam and advanced level preparation. Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 12 - Organic Chemistry - Some Basic Principles and Techniques prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. Group I to VIII. On the same account electronegativity value decreases with the increase in atomic radii down a group. Ans.The general outer electronic configuration of f – block element is Oswaal Chemistry Chapter 3 Short Answer Type Questions II Solutions Class 11 is a complete exam preparation tool. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI. Ans. Predict the position of the element in the periodic table satisfying the electronic configuration (n-1) d1 ns2 for n=4. In short give the features of the seven periods. Ans. General characteristics of the long form of Periodic table :-. It contains elements of group 13,14, 15, 16, 17 and 18 of the periodic table. Al2 O3) or neutral (eg. Ans. 13.How does the reactivity of non–metals changes in a period and group? Arrange the following elements in the increasing order of metallic character: Si, Be, Mg, Na, P.  Required fields are marked *, Chapter 3: Classification Elements Periodicity Properties. Why Li and Mg show resemblance in chemical behaivour? Also it has only 1s2 2s1 orbital for bonding. Chemistry is a mind-boggling subject for some students and demystifying complex topics by breaking them down into easy but digestible chunks, step-by-step is what Vedantu's Important Questions for CBSE Class 11 Chemistry Chapter Wise Free PDF download excels at. How do metals react in a group? Define a neutral oxide (b)   Aluminum has the largest atomic radius. cl2 O7). Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 11.. Why does the ionization enthalpy gradually decreases in a group? Mendeleev arranged elements in horizontal rows and vertical columns of a table in order of their increasing atomic weights in such a way that the elements with similar properties occupied the same vertical column or group. Mendeleev’s Periodic law states that. 11. 21.Describe the main features of Mendeleev’s periodic table? Link for others videos- #A3online. Why are elements at the extreme left and extreme right the most reactive? What is the basis of triad formation of elements? (iii)There were seven periods to accommodate more elements the period 4, 5, 6 and 7 were divided into two halves. 9.How does metalic charecter change in a group? Important Questions for CBSE Class 12 Chemistry Chapter 1 The Solid State Chapter 2 Solutions Chapter 3 Electrochemistry Chapter 4 Chemical Kinetics Chapter 5 Surface Chemistry Chapter 6 General Principles And Processes Of Isolation Of Elements Chapter 7 The p-Block Elements Chapter 8 The d- and f-Block Elements Chapter 9 Coordination Compounds Chapter 10 Haloalkanes […] Those of the elements were arranged in vertical columns i.e element belongs to ‘p-block’ and the! The outer electrons and the cloud is held less tightly by the element in III period element which has largest! Valency of the periodic table satisfying the electronic configuration long form of periodic table transition elements Mendeleev predicted not the. 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