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- Periodic classification Of elements Class 10 NCERT
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- Periodic Classification of Elements Chapter Wise Important Questions Class 10 Science
- View PDF CBSE Class 11 Chemistry Periodic Classification of Elements MCQs
It is, therefore, bigger in size. It can gain one electron to become stable. So, its valency is equal to one.
Periodic classification Of elements Class 10 NCERT
It is, therefore, bigger in size. It can gain one electron to become stable. So, its valency is equal to one. It can gain one electron to form negative ion. So, it is a non-metal. So, it is larger in size. It can lose one electron to become stable. So, its valency is equal to 1. Atomic mass as a physical property and nature and formulae of oxide and hydride formed, and chemical property was used by Mendeleev.
Chemical properties do not depend upon atomic mass. Therefore, fluorine is more reactive than chlorine. Justify your answer. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. The atomic masses of chlorine and iodine are Predict the atomic mass of bromine.
It is because all the elements discovered at that time could not be classified into triads. How do the following properties of M and N vary? Metallic character goes on decreasing from left to right as tendency to lose electrons decreases due to decrease in atomic size.
Valency goes on increasing first and then decreases. The elements A and C combine with chlorine to form an acid and common salt respectively. The oxide of element A is liquid at room temperature and is a neutral substance, while the oxides of the remaining six elements are basic in nature. It was found that elements A and G combine to form an ionic compound.
This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neutral. Based on the above information answer the following questions:. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water.
Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of element D is almost neutral. Answer the following questions based on the information given herein:. If the element has 1, 2, 3, 4 valence electrons, its valency will be 1, 2, 3, 4 respectively. If the element has 5, 6, 7, 8 valence electrons, its valency will be 3, 2, 1, 0.
Element with atomic number 9 has electronic configuration 2, 7. So, its valency will be 1. Explain with one example. The position of element depends upon number of valence electrons which depend upon electronic configuration. Those elements which have same valence electrons, occupy same group. Those elements which have one valence electron belong to group 1. Elements with two valence electrons belong to group 2. Period number is equal to number of shells. If valence electrons are equal to 1, it belongs to group 1.
If it has 2 shells, it belongs to second period, e. It has one valence electron, it belongs to group 1 and it has three shells therefore, it is in third period. Which two of these elements will show similar chemical properties? Electronic configuration of X, Y and Z will be: X 9 : 2, 7 Y 11 : 2, 8, 1 Z 17 : 2, 8, 7 X and Z will show similar chemical properties due to same number of valence electrons.
First element has 1 valence electron and last element has 8 valence electrons. Number of shells remain the same in the same period. Which of these elements has physical and chemical properties resembling those of Calcium and why? Elements with atomic number 12, 38 resemble calcium in physical and chemical properties because they have same number of valence electrons and belong to same group 2.
The metallic character goes on decreasing along a period from left to right because atomic size goes on decreasing therefore, tendency to lose electrons decreases. Compare them with respect to: periodic table from the left to the right and why? How many a groups and b periods are there in the Modern Periodic Table? State reason for your selection in each case. State its a electronic configuration, b valency. Justify your answer with reasoning.
It can gain one electron to become stable therefore, its valency is equal to 1. It belongs to third period, as it has three shells. It belongs to group 17 because it has 7 valence electrons. State the formula of barium nitrate and barium sulphate, if barium belongs to the same group as magnesium. Its both shells are completely filled. Find the atomic number of these elements.
State the nature and formula of the compound formed by the union of these two elements. State the period of the periodic table to which these elements belong.
Give reason for your answer. What will be formula of the compound formed and the nature of bond between them when these two elements chemically combine together? Its electronic configuration is 2, 8, 7.
Its valency is equal to 1. Its electronic configuration is 2, 8, 8, 2. Ionic bond will be formed. State reason to support your answer. These elements belong to second period because these elements have two shells. A has electronic configuration 2, 1 and has one valence electron so, belongs to group 1. All of them contain two shells and so belong to second period. Which of these a has the largest atomic radius, b is most reactive? Justify your answer stating reason for each. Which of these elements a has the largest atomic radius, b is least reactive?
Metallic character increases down the group. Metallic character decreases along a period from left to right. It helped in discovery of new elements.
It helped in correction of atomic mass of somd of the elements. Their valencies are 1 and 2 respectively in forming oxides. What is the electronic configuration of F? What is the number of valence electrons in the atom of F? What is the number of shells in the atom of F? Out of the three elements B, E and F, which one has the biggest atomic size? F has electronic configuration 2, 8, 2. F has 2 valence electrons.
What would be the nature of compound formed by a combination of elements B and F? Which two of these elements could definitely be metals? Which one of the eight elements is most likely to be found in gaseous state at room temperature?
If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G. A and B belong to group 1 and 2 because they form basic oxides.
C belongs to group 13 as it has 3 valence electrons. D belongs to group 14 as it forms almost neutral oxide. E and F belong to group 15 and 16 as they form acidic oxides, G belongs to group 17 as it has 7 valence electrons and H belongs to group They belong to 3rd period of the Periodic Table because AG is NaCI, added in a small amount to almost all vegetable dishes during cooking and Na and Cl belong to 3rd period.
A and B are definitely metals as they form basic oxides. G and H are gaseous at room temperature.
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Question 1. What is the basic theme of organisation in the periodic table? This has made the study simple because the properties of elements are now studied in form of groups rather than individually. Question 2. Which important property did Mendeleev use to classify the elements in this periodic table and did he stick to that? He did stick to it and classify elements into groups and periods. Question 3.
Periodic Classification of Elements Chapter Wise Important Questions Class 10 Science
Multiple Choice Questions for important part of exams for Grade 11 Chemistry and if practiced properly can help you to get higher marks. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning.
View PDF CBSE Class 11 Chemistry Periodic Classification of Elements MCQs
Multiple Choice Questions for important part of exams for Grade 11 Chemistry and if practiced properly can help you to get higher marks. Gradual addition of electronic shells in the noble gases causes a decrease in their. Which of the following is isoelectronic as well as has the same structure as that of N 2 O?
Class 11 chemistry paper is for 70 marks and the rest 30 marks are for your practical examination. To score well in the examination will require a clear and logical understanding of each chapter. It is advisable to practice all the questions from your NCERT textbook and chemistry chapter 3 class 11 important questions pdf. Using both of these in combination will improve your knowledge of the subject and the score for the same. The class 11 Chemistry syllabus is divided into 14 chapters in total. The weightage marks of each chapter are given below.
NCERT Solutions are very useful for students to learn how to answer questions efficiently in an exam. Students will study various topics in this unit regarding the nomenclature of elements in the periodic table, their properties and more. The topic classification of elements educates students on why we need to classify elements, the need for preparing, periodic table and grouping elements with similar properties together. The concept of several topics like atomic and ionic radii, types of elements, electronic configuration, etc. With the expert-written solutions provided, students can enhance their learning and paper attempting skills. In the annual examination, this unit holds a weightage of 4 marks.
Online view is also being provided for the convenience of students. Modern Periodic Law : the physical and chemical properties of elements are the function of their atomic numbers. As the effective nuclear charge on the valence electrons in the metals is comparatively less, they have tendency to form cations. Fluorine atom is smaller than chlorine atom as it has less number 2 of shells compared to that in chlorine shells 3.
Question 1. Compare and find out. Question 2. Question 3. Question 4.
The first section of the chapter focuses on the early attempts at the classification of elements so as to make order out of chaos. Under this section, the emphasis is laid on the following important classification of elements:. The drawbacks of both the system of classification mentioned above are also explained in the chapter, Periodic Classification of Elements. In Newland's law of orders, the comparison of elements with that of notes of the musical instrument is shown. The second section of the chapter, Periodic Classification of Elements talks about Mendeleev's periodic table wherein, the classification of elements is done on the basis of the atomic mass of the elements.
Who was the first scientist to classify elements according to their properties? The German Chemist, Johann Dobereiner in early was the first to consider the idea of trends among properties of element. The middle element of each of the triads had an atomic weight about half way between the atomic weights of the other two. Also the properties of the middle element were in between those of the other two members.
Он не чувствовал никакой боли - один лишь страх. Пуля ударила в кафельную плитку азульехо чуть сзади.