NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements

### A:

(b) Mg

Reason: X would most likely be in the same group as of the Magnesium (Mg) in the Periodic Table because the formula of chloride of X (XCl2) suggests that the valency of X is +2.

### A:

(c) The atoms lose their electrons more easily.
Reason : When we move from left to right across the periods of the periodic table, the non-metallic character increases. Therefore, the tendency to lose electrons decreases.

### A:

The element with atomic number 12 (electronic configuration 2,8,2) and 38 (electronic configuration 2,8,2) have same chemical properties as that of calcium because both of them have same number of valence electrons (2) like calcium.

### A:

(a) The atomic number of this element is 17.
(b) It would be chemically similar to F (atomic number 9) having configuration as 2, 7 which means same number of valence electrons as the given element has.

### A:

(a) All the elements in the same column as boron have the same number of valence electrons (3).

(b) All the elements in the same column as fluorine have the same number of valence electrons (7). All of them will have valency equal to -1.

### A:

Electronic configuration of an element gives the information about number of shells and the number of valence electrons present in the element.

We can find the group number with the help of number of valence electrons.

Number of shells present in an element is equal to period in which this element is placed.

Thus, by knowing electronic configuration we know the group number and period number of an element, which indicates the position of an element in the periodic table.

### A:

Electronic configuration of Nitrogen is 2,5 and that of Phosphorus is 2, 8, 5.

Nitrogen will be more electronegative than phosphorus because electronegativity decreases on moving from top to bottom in a group.

### A:

(a) A is a non-metal.
(b) C is less reactive than A because reactivity decreases down the group in halogens.
(c) C will be smaller in size than B because on moving from left to right in a period, the nuclear charge increases and therefore, electrons come closer to the nucleus.
(d) Element A will form an anion because it accepts an electron to complete its octet.

### A:

 S.No. Mendeleev’s periodic table Modern periodic table 1. Elements are arranged in the increasing order of their atomic masses. Elements are arranged in the increasing order of their atomic numbers. 2. No place for isotopes. No such problem occurs as elements are arranged on the basis of their atomic numbers. 3. Groups were divided in subgroups A and B. Groups are not subdivided. 4. It has 8 groups. It has 18 groups.

### A:

(a) Neon. It has two shells, both of which are completely filled with electrons (2 electrons in K shell and 8 electrons in L shell).

(b) Magnesium. Its electronic configuration is 2, 8, 2.

(c) Silicon. It has a total of three shells, with four electrons in its valence shell (2 electrons in K shell, 8 electrons in L shell and 4 electrons in M shell).

(d) Boron. It has a total of two shells, with three electrons in its valence shell (2 electrons in K shell and 3 electrons in L shell).

(e) Carbon. It has twice as many electrons in its second shell as in its first shell (2 electrons in K shell and 4 electrons in L shell).

### Benefits of NCERT Solutions

NCERT Solutions for Class 10 contain immensely significant points and for every chapter, each concept is simplified so that it turns out to be easy to remember that expands the odds of scoring commendably in the board exams. NCERT Solutions for class 10 by Extramarks is the best reference material for test preparation. Given below are a couple of points about how these solutions help in exam preparation.
1. It helps students practice loads of questions from every chapter which encourages them to make their concepts more grounded..

2. NCERT Solutions for Class 10 encourages you to upgrade your knowledge and clear your concepts with the goal that you can score well in your exams.

3. These solutions are the best examination materials to know your weak and strong points. It is essential to work on your weak points to score well in the exams.

4. Most of the questions in exams are asked in a similar arrangement from NCERT textbooks. Hence, students should altogether revise every chapter’s solution to get a good command in subjects

### Tips & Strategies for Class 10 Exam Preparation

1. Make a timetable to complete your syllabus and make time for revision.

2. Refer to NCERT Solutions given on the Extramarks website to clear your concepts anytime while preparing for your exams.

3. Start studying with the help of Extramarks – The Learning App to pass your exams with flying colours. It provides complete study material with solved and unsolved papers.

4. It is important to clear all your doubts before the exam with your teachers or Alex (an AI studybot).

5. While reading or learning a chapter, make sure to make notes with algorithms, formulas, theorems, etc., and study them for a quick revision before exams.

6. Practice an ample number of question papers to make your concepts stronger.

7. Take rest and a proper meal. Don’t stress too much.

### Why opt for Extramarks NCERT Solutions for Class 10 ?

Extramarks provide NCERT Solutions for all subjects at your fingertips. These solutions are designed by subject matter experts and provide solutions to every NCERT textbook questions. Extramarks especially focuses on making learning interactive, effective and for all classes. We provide free NCERT Solutions for class 10 and all other classes

How to use NCERT Solutions for scoring in class 10 Maths CBSE Board Exams?

NCERT 10 solutions for math are in-depth solutions written in very basic and simple language which makes them easy to understand. It gives sufficient study material to practice with to the students which the latter can use for practicing for board exams. Extramarks website has NCERT solutions for all classes that can be used by students of different classes. These solutions can be accessed by visiting the footer section of the website. Prepare notes and learn from NCERT solutions, go through them thoroughly before the exam, and practice with the questions that crop up in NCERT solutions.

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Why are the NCERT solutions Important for Class 10?

Extramarks class 10 NCERT solutions are crucial for board preparation for students. These solutions are given in a simple language which makes it easy to understand for all and it proves to be the basis for board examination which further helps the students in understanding the extensive study material. Class 10 NCERT solutions focus on fundamental clarity of the concepts which further helping in clearing all doubts and helping students achieve concept clarity. NCERT solutions provide enough practice and study material to students that they can use to test their knowledge

Will NCERT solutions of Class 10th be good enough to prepare for the Class 10 Board exams?

Yes, class 10 solutions (NCERT) are sufficient to prepare for class 10 board exams. NCERT solutions are simple and easy to understand written in a way that is appealing to students. NCERT solutions form the basis of examination of class 10 board so they prove to be a sufficient solution which also gives enough study material to practice with to students. Different types of NCERT solutions help students prepare for the exam through varied formats and provide them concept clarity.

Do I need to use textbook solutions other than NCERT solutions for Class 10 exam prep

Class 10 CBSE NCERT solutions are sufficient to prepare for board exams but if you want to test your knowledge and would like to browse more solutions then you can use textbook solutions to prepare for the exam. Although the NCERT solutions are enough for preparing for the exam, you can check out the solved and unsolved sample papers along with textbook solutions from Extramarks - The Learning App and website

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