In these elements the last electron is added to the third to the outermost energy level. There block consists of the elements lying between s and p block starting from 4th period and onwards. Why does the ionization enthalpy gradually decreases in a group? Ans. Ans.The German Chemist, Johann Dobereiner in early 1829 was the first to consider the idea of trends among properties of element. Na and K have similar physical and chemical properties because they have same number of valence electrons. Free PDF download of Important Questions with Answers for CBSE Class 12 Chemistry Chapter-3-electrochemistry 2 Marks Questions prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books On CoolGyan.Org to score more marks in CBSE board examination. What is the general outer electronic configuration of f – block elements? The effective nuclear charge per electron decrease in the anion and the cloud is held less tightly by the nucleus. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 11.. (i)There are in all 18 vertical columns i.e. Also Access CBSE Class 11 chemistry Sample Papers. Ans. Ans.Neutral oxides have no acidic or basic properties. 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. View the Important Question bank and notes for Class 11 & 12 Chemistry. Ans. 5. Due to high electron affinity. Get General Organic Chemistry important questions for Class 11 exams. Na+ and Ne both has 10 electrons but Na+ having, 11 protons in its nucleus (Ne has 10 protons) exert higher effective nuclear charge and thus removal of electron from Na+ requires more energy. Question from very important topics are covered by NCERT Exemplar Class 11.You also get idea about the type of questions and method to answer in your Class 11th … 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. Ans. Ans. Register online for Chemistry tuition on CoolGyan.Org to score more marks in your examination. Most Important Question Of Chemistry Class 11 3. 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. 23. The combining capacity of an element is known as valency. 3.Give the main features of s-block elements. d – block elements :- The elements in which the last electron enters the d – orbitals of their last but one energy level constitute d – block elements. Electron gain enthalpy – When an electron is added to a neutral gaseous atom (x) to convert it into a negative ion, the enthalpy change accompanying the process is defined as the electron gain enthalpy. What is the electronic configuration when elements are classified group wise? Ans. Ans. These questions are created by experts and are as per the latest exam pattern. The electronic configuration of the element is 1s2 2s2 2p6 3s2 3p4. It will be an alkali metal with valency 1.  (n – 2) f1-14 (n – 1) d0-11 ns2. Download free printable worksheets for CBSE Class 11 Chemistry with important topic wise questions, students must practice the NCERT Class 11 Chemistry worksheets, question banks, workbooks and exercises with solutions which will help them in revision of important concepts Class 11 Chemistry. 19. (a)  Which has the highest first ionization enthalpy? Why Li and Mg show resemblance in chemical behaivour? The reactivity of non – metals increases from left to right in a period whereas reactivity decreases in a group as we go down the group because the tendency to accept electrons decreases down the group. f – block elements : The elements in which the last electron enters the f – orbital of their atoms are called f – block elements. Thus the increase in electronegativities across a period is accompanied by an increase in non – metallic properties of elements. The vertical columns were called groups and the horizontal rows were called periods. Oswaal Chemistry Chapter 3 Short Answer Type Questions II Solutions Class 11 is a complete exam preparation tool. Here you can read Chapter 3 of Class 11 Chemistry NCERT Book. MP Board Class 11th Chemistry Important Questions Chapter 3 Classification of Elements and Periodicity in Properties Classification of Elements and Periodicity in Properties Important Questions. 10.The size of an atom can be expressed by three radii. So, they must practice these CBSE Important Questions Class 11 Chemistry Chapter 3 Classification of … The atomic radius of elements decreases along the period but Neon has highest size among III period element? Required fields are marked *, Chapter 3: Classification Elements Periodicity Properties. What is an amphoteric  oxide? Please SUBSCRIBE our YouTube channel, like and comments also. These will help you in your Class 11 exams as well as entrance exams like JEE, NEET, etc. 20. Why. Class 11 Chemistry Chapter 3 2. Ans. 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. Electronegativity is inversely related to the metallic properties of elements. Design in accordance with the latest CBSE syllabus as well as examination pattern, this books aid students in getting good marks in the exam. Register online for Chemistry tuition on Vedantu.com to score more marks in your examination. In a group, the increase in atomic and ionic radii with increase in atomic number generally results in a gradual decrease in ionization enthalpies. (b)   Aluminum has the largest atomic radius. Second and third periods contain 8 elements each namely 3 Li to 10Ne and 11Na to 18Ar and is a short period. Ans.The tendency of an element to lose electrons decreases in going from left to right in a period. Ans. The physical and chemical properties of the elements are periodic functions of their atomic numbers. Hydrocarbons can be described as compounds which consist of entirely carbon and hydrogen. 4.Give the main features of p-block elements. 6.Give the main features of f-block elements. The general electronic configuration of s – block elements is ns1-2. NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. 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. It has all other elements starting with 87Fr onwards. Chemistry Important Questions Class 11 are given below chapter wise. In short give the features of the seven periods. NCERT Solutions For Class 11 Chemistry Chapter 3: Classification of Elements and Periodicity in Properties is one of the most important chapters of CBSE Class 11 Chemistry.Students must have detailed knowledge of this chapter to understand the various concepts in higher classes. Also it has only 1s2 2s1 orbital for bonding. Ans. This causes increase in size. General characteristics of the long form of Periodic table :-. (iii)There were seven periods to accommodate more elements the period 4, 5, 6 and 7 were divided into two halves. Ans. The outermost electronic configuration will be 8s1. Students can find all type of questions such as short answer, long answer, match the following, assertion and reasoning. Seventh period is incomplete. It increases from top to bottom in a group. the tendency to lose electrons increases as we go down a group so the reactivity of metals increases down the group. cl2 O7). Na2O) whereas that formed by the element on extreme right is the most acidic (eg. Ans. Thus the element belongs to ‘p-block’ and is placed in third period and 16th group of the periodic table. First to consider the idea of trends among properties of element NCERT Exemplar Problems 11... We go down a group, the elements lying between s and p block starting from 4th and! The lowest value of the elements were arranged in vertical columns were called periods Exemplar Class 11 given... 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