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5. Periodic Classification of Elements Science class 10 in English Medium ncert book solutions Text-book Questions
5. Periodic Classification of Elements Text-book Questions – Complete NCERT Book Solutions for Class 10 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 5. Periodic Classification of Elements Text-book Questions to help you master concepts and score higher.
5. Periodic Classification of Elements Science class 10 in English Medium ncert book solutions Text-book Questions
NCERT Solutions for Class 10 Science play an important role in helping students understand the concepts of the chapter 5. Periodic Classification of Elements clearly. This chapter includes the topic Text-book Questions, which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 10 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 5. Periodic Classification of Elements is explained in a structured way, making it easier for students to connect the theory with the topic Text-book Questions. By studying these updated NCERT Solutions for Class 10 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
5. Periodic Classification of Elements
Text-book Questions
Text-book Questions
Page no. 81
Q1. Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Answer: Yes, triples are also found in Newlands's octave column. Example:- Li, Na and K.
Q2. What were the limitations of Döbereiner’s classification?
Answer: Dobereiner could identify the triad of only three elements at that time and classification of all the elements could not be done according to their triad.
Q3. What were the limitations of Newlands’ Law of Octaves?
Answer: Newlands's octet theory was able to classify elements with atomic mass up to calcium only.
Page no. 85
Q1.Use Mendeléev’s Periodic Table to predict the formulae for the oxides of the following elements:
K, C, AI, Si, Ba.
Answer: K - K2O , O - O2 , Al - Al2O2 ,Si - SiO2 , Ba - BaO .
Q2. Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table? (any two)
Answer: Scandium and Germanium.
Q3. What were the criteria used by Mendeléev in creating his Periodic Table?Answer: Noble gases are inert, hence kept in separate group.
Answer: Mendeleev separated the elements according to their atomic number. He tried to put elements with similar properties in a group.
Q4. Why do you think the noble gases are placed in a separate group?
Answer: Noble gases are inert, hence kept in separate group.
Page no. 90
Q1. How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?
Answer: (i) Elements are separated according to their atomic numbers in the modern periodic table. Hydrogen was placed in the first group.
(ii) The position of the elements in the periodic table shows their chemical reactivity.
(iii) Elements are placed in different order according to their weight, heavy and light.
Q2. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Answer: Both beryllium (Be) and calcium (Ca) are like magnesium.
shows reactivity. Both have 2 valence electrons in their outer shell, Be(2,2) and Ca(2,8,8,2).
Q3. Name
(a) three elements that have a single electron in their outermost shells.
(b) two elements that have two electrons in their outermost shells
(c) three elements with filled outermost shells.
Answer: (a) Lithium (Li), Sodium (Na), Potassium (K).
(b) Magnesium (Mg), Calcium (Ca).
(c) Neon (Ne), Argon (Ar), Krypton (Kr).
Q4. (a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
Answer: (a) 'Yes' Atoms of these elements have similarity. They have only 1 electron in their outermost shell. Their valencies are also similar.
(b) 'Yes' in these also there is similarity. Both have valency ' o ' and their outermost shell is complete
Q5. In the Modern Periodic Table, which are the metals among the first ten elements?
Answer: Lithium and Beryllium are metals.
Q6. By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
Ga Ge As Se Be
Answer: Be
See other sub-topics of this chapter:
1. Chapter Review 2. Text-book Questions 3. Exercise 4. Additional Questions With Solutions 5. Additional Questions With Solutions