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Online view is also being 10th ncert guide 40 for the convenience of students. Modern Periodic Law : the physical and chemical properties of elements are the 10th ncert guide 40 of their atomic numbers.

As the effective nuclear charge on 10th ncert guide 40 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. Isotopes are the elements having similar chemical properties but different atomic masses. For example, argon with atomic mass of 40 comes before potassium with atomic mass Iodine at.

For example, copper, silver and gold are placed in 10th ncert guide 40 same group with alkali metals. Mercury, lead and barium which possess similar properties fall into different groups.

Question 2: Mention the position of i hydrogen and ii isotopes of same element in the modern periodic table. Answer 2: i Hydrogen is 04 at the top of group IA. Question 1: Why is atomic number of an element more important to a chemist than its atomic mass?

Or Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Answer 1: The properties of element depend upon the number of electrons present in the valence shell which are related to atomic 10th ncert guide 40. Thus the properties of different elements can be compared if we know their atomic numbers. On the other hand, 10t mass can in no way determine the chemical properties of elements, because is does not vary regularly 10th ncert guide 40 gradation in the chemical properties of elements.

Justify your answer in each case. Answer 2: a Electronic configuration of X is 10th Ncert Guide 2, 8, 8, 2. Its valency is 2. It belongs to group 2 and can lose 2 electrons easily.

Since valency of Y is -2 2, 6. Question 3: The 10th ncert guide 40 Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of Modern Periodic Table. Give reason to justify guid answer in ncerr case. Answer 3: a Group 1.

These all have one valency. Its outermost orbit is very near to the nucleus and so removal of electron is a little difficult. It occupies three shells. Download Offline Solutions Apps to use without internet, free of cost. Write two reasons responsible for the late discovery of noble gases. State Modern Periodic Law. What is the Modern Periodic Table called? Metals have tendency to form cations. Why is Fluorine atom smaller than chlorine atoms?

Given reason why Non-metals have tendency to gain electrons? Important Questions on 10th Science Chapter 5 What property do all elements in the same column of the Periodic Table as boron have in common?

All the elements in the same column as boron have the same number of valence electrons 3. Hence, they all have valency equal to 3. What property do all elements in the same column of the Periodic Table as fluorine have in common? All the elements in the same column as fluorine have the same number of valence electrons 7.

Hence, they all have valency equal to 1. How does the electronic configuration of an atom relate to its position in the Modern Periodic Table? In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the.

Elements across a period show an increase in the number of valence electrons. In the Modern Periodic Table, calcium atomic number 20 is surrounded by 10th ncert guide 40 with atomic numbers 12, 19, 21, and Which of these have physical and chemical properties resembling calcium? The element with atomic number 12 has same chemical properties as that of ncedt.

This is because both of them have same number of valence electrons 2. Only few triads were. It was applicable 10th ncert guide 40 to calcium. The properties of the elements listed after gjide showed no resemblance to the properties of the elements above.

What were the criteria used by Mendeleev in creating his Periodic Table? This means that if elements are arranged in the increasing order of their atomic masses, then 10th ncert guide 40 properties get repeated after regular intervals. Why 10th ncert guide 40 you think the noble gases are placed in a separate group? Noble gases are inert elements. Their properties are different from the all other elements.

Therefore, the noble gases are placed in 10hh separate group. Chapter 6: Life Processes �.

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NCERT Solutions for Class 6 Maths Chapter 5 10th Class Science Ncert Guide 10 Understanding Elementary Shapes are available here so that students can learn better and more effectively. These materials in PDF format can be downloaded by the students to practise offline. Apr 22, �� NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class Question from very important topics are covered by NCERT Exemplar Class You also get idea about the type of questions and method to answer in your Class . NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry plays a pivotal role in the CBSE class 12 Chemistry examination. Chemistry Class 12 solutions Chapter 3 is a comprehensive material that has answers to the textbook questions solutions, important questions from previous papers.

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