classification of elements class 10

(i) Third period 1. (viii) D, Question 12. Give reason. Since the atomic radius decreases along a period, the atomic radius of calcium is smaller than that of potassium. Q3. (CBSE … Hydrogen is placed above alkali metals as it has one valence electron. How does the metallic character change along the period? Rowlatt act and Jallianwala Bagh Massacre, NCERT Solutions - The Rise of Nationalism in Europe, Nouns - Practice Quiz (Fill In The Blanks), Test: The Rise Of Nationalism In Europe - 3, Test: Periodic Classification Of Elements - 1. D) D and E, Q28- Where would you locate the element with electronic configuration 2,8 in modern periodic table? It also means separating similar elements from the dissimilar ones. (e) D has bigger atomic radius. technology to drive streamlined access to best-matched mentors & leading global Universities. (vi) Which one of the given elements is likely to have the smallest atomic radius? We know that the atomic size increases down the group and decreases along a period. B) Mg The oxide of D is almost neutral. Delhi 110024, Leverage Edu Mumbai, D) None, Q6- Atomic mass is equal to the sum of ____. Write two main characteristics of Mendeleev’s periodic table and write name of elements of second period. (iii) Which two of these elements could definitely be metals and which are likely to be non-metals? (vi) H (a) Fluorine (F) is the most electronegative and nitrogen (N) is the least electronegative. (a) Yes. Question 5. Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the Modern Periodic Table and how valency of an element is calcualted on the basis of its atomic number. Answer: Pick any one out of them. (c) Which two elements amongst these belong to the same period? Class 10 students definitely take this Periodic Classification Of Elements -2 exercise for a better result in the … A) Mendeleev The defects of Mendeleev’s periodic table are: 1. (iii) Metals—A and B ; Non-metals—E, F, G (b) Be is least reactive because Be has the least tendency to lose electrons. According to the Mendeleev’s classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties. The electronic configuration of P is 2, 8, 8, 2. Which of these elements 1800-212-7858 / 9372462318. Question 5. Periodic Classification of Elements Class 10 Important Questions with Answers Science Chapter 5 Periodic Classification of Elements Class 10 Important Questions Short Answer Type. The properties of elements depend upon valence electrons in the atom which in turn depends on the total number of electrons, i.e., atomic number. How does the metallic character of elements vary on moving down a vertical column? Contact Us. Mendeleev’s Periodic Table is one of the most important concepts to cover in the chapter on the periodic classification of elements. (iii) How does the atomic size vary as you go down a group? (b) Yes, because they have similar properties and the mass of magnesium (Mg) is roughly the average of the atomic masses of Be and Ca. Why group 17 elements form uninegative anions? (ii) What are the common properties on the basis of which the elements have been grouped together? (ii) Atomic radius increases. D) Iodine, Q8- Electron affinity is ____. (e) The formula of their oxides Question 12. C) Si 2. (a) How would the tendency to lose electrons change as you go : This document is highly rated by Class 10 students and has been viewed 14134 times. Only one triad of Dobereiner's triads exists in the columns of Newland's octaves. A) Size of an atom (i) Atomic radius decreases along a period. Answer: A) Cl>Si>Al>Mg>Na Yes, this periodicity is due to the periodicity in the number of electrons in the outermost shell of the atoms of the elements. Limitations of This TheoryDobereiner’s Triads theory fails to organize the known elements in the triad form. Also, go through the differences between the modern periodic table and Mendeleev’s periodic table with our expert answers. A) top left corner (i) Why do we classify elements? Write the electronic configuration of these two elements in terms of K, L, M, N shell Predict whether these are metallic or non-metallic. A) size of an atom It includes the transition element which lies in between s and p block elements. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Electronic configuration is 2, 8, 2. Elements have been classified into 4 different blocks. 1. Question 8. C) electrons in an atom Na+ is smaller as it has lesser number of shells than Na. Answer: As per Periodic Classification of Elements, the Newland’s law of octaves states that , “When the elements are arranged in the order of their increasing atomic masses, then the chemical and physical properties of every 8th element of the order have the repetition of the first element’s properties.”. Leverage Edu is a one-stop-shop for all your career-related needs - right from finding the best-fit college to (ii) down a group in the Modern Periodic Table? Question 46. B) salt forming C) Metalloids Answer: Contact us on below … Mendelèev 'a Periodic table Created by VideoShow:http://videoshowapp.com/free A-258, Bhishma Pitamah Marg, Answer: (b) 2, 8, 1 Atomic size of elements down a group increases. Leverage Edu helps students make career choice & university admission decisions, using simplified technology to drive streamlined access to best-matched mentors & leading global Universities. In how many groups and periods, the Modern Periodic Table of elements is divided? Calcium is an element with atomic number 20. The elements of the third period of the Periodic Table are given below: (a) Which atom is bigger, Na or Mg? Mendeleev left some gaps in is Periodic Table for the elements yet to be discovered. There are seven periods. Answer: C) atoms lose electrons easily (b) Write the electronic configuration of X. (i) left to right in a period? Isotopes of the same element can be placed within the same group due to the same atomic number. B) N,F,O This is because ability to lose electrons increases on moving down the group due to increase in distance between the nucleus and the valence electrons. Innov8, 3, 20 Main Road (vii) Which one of the eight elements would have the largest atomic radius? In Mendeleev’s Periodic Table the two isotopes of chlorine, Cl-35 and Cl-37 would be placed in different slots because they have different atomic masses. A) always negative B) same number of neutrons For example. (b) The three compounds are X (NO3)2, XSO4, and X3(PO4)2. customised services that resonate with your personal career needs. (iii) From this arrangement, we find that the atomic size (or radius) increases down the group. What is such an arrangement of elements called as? Want to learn by Video Lectures? A) group 1 Leverage Edu Tower, If elements having the same number of valence electrons are grouped together, the elements falling within each group are similar in chemical properties. Does the periodicity in properties is a function of valence electrons? The number of electron in the valance shell increases as we move from the left to right. So, it shares its 4 electrons and forms covalent bond with 4 chlorine atoms. Sodium is more reactive than lithium because sodium is larger in size. (iv) Metal Sep 27, 2020 - Chapter 5 Periodic Classification of Elements - PPT (Powerpoint Presentation) | EduRev Notes is made by best teachers of Class 10. Ans: Two elements with symbol X (atomic no. (b) The metal which an important constituent of limestone. B) Mg Answer: Q1- Vertical columns are called as - Each of these elements possesses different properties. Is the statement true, justify? (i) from left to right in a period? Question 10. Periodic Classification of Elements Class 10 Important Questions Short Answer Type I. This is because both of them have same number of valence electrons (2) as calcium. Write the names given to the vetical columns and horizontal rows in the Modern Periodic Table. Answer: CBSE Class 10 Science Syllabus Traditional Laws of Periodic Classification of Elements The periodic classification of elements refers to the tabular arrangement of different elements. B) Hydrogen-1 Your email address will not be published. Answer: Answer: Question 37. The elements in this group are also known as the chalcogens.

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