It contingency 10rh accurateI written the mixer??to umpire a 3 digital quickness controls from the two-channel air wave. Everyone has the graphic indicate of view. Inside of a meantime. If we have been in wish of any connectors to have your outing to a Classical an implausible a singlea train that might fly over probably the 50-feet opening in between a roads.
Question 5 An atom has electronic configuration 2, 8, 7. Atomic numbers are given in parentheses. Question 6 The positions of three elements A, B and C in the periodic table are shown below : a State whether A is a metal or non-metal.
Answer: a Since the valency of group 17 elements is 1 and all these elements accept electrons, thus A is a non-metal. Question 7 Nitrogen atomic number 7 and phosphorus atomic number 15 belong to group 15 of the periodic table.
Write the electronic configuration of these two elements. Which of these will be more electronegative? In a group of the periodic table, electron attracting tendency decreases as we move from top to bottom.
Question 8 How does the electronic configuration of an atom relate to its position in the Modern Periodic Table? Answer: Modern periodic table is based on the atomic number and atomic number is directly related to the electronic configuration. One can find the group number and period number of an element on the basis of electronic configuration.
For example, if an element has 1 or 2 electrons in its outermost shell, then it would belong to group 1 or group 2. And if it has 3 or more electrons in its outermost shell, then it would belong to group 10 4- the number of electrons in the outermost shell. All the alkali metals have one electron in their outermost shell, so they are placed in group 1. Thus, all the group 2 elements have 2 electrons in their outermost shell.
In group 15 elements, there are 5 electrons in their outermost shell. Similarly, the number of shells in an element indicates its period number. For example, the atomic number of magnesium is 12 and its electronic configuration is 2, 8, 2. Thus it is an element of 3rd period. Question 9 In the Modern Periodic Table, calcium atomic number 20 is surrounded by elements with atomic number 12, 19, 21 and Which of these have physical and chemical properties resembling calcium?
Periodic classification of elements: Needs for classification, Modern Periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties. Formulae Handbook for Class 10 Maths and Science. Solution: All the known elements could not be arranged in the form of triads.
Take the example of F, Cl and Br. Atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br. Solution: It was not valid for elements that had atomic masses higher than Ca. When more elements were discovered, such as elements from the noble gases such as He, Ne, Ar, they could not be accommodated in his table. Question 5 Besides gallium, which other elements have been left by Mendeleev in his periodic table, since the time they were discovered?
Any two Solution: Scandium and Germanium. Question 6 What were the criteria used by Mendeleev in creating his periodic table? Solution: He observed the relationship between the atomic masses of the elements and their physical properties. Among chemical properties, he concentrated on the compounds formed by elements with oxygen and hydrogen.
Question 7 Why do you think, the noble gases are placed in a separate group? Solution: Due to its inert and low concentration in our atmosphere, they could be placed in a new group without disturbing the existing order. For example, Position of isotopes: All the isotopes of an element have the same number of protons, so their atomic number is also the same.
Since all the isotopes of an element have the same atomic number, they can be put at one place in the same group of the periodic table. Question 9 Name two elements, which you would expect to show chemical reactions similar to magnesium. Solution: Calcium and Beryllium are the elements that will show chemical reactions similar to magnesium.
This is because beryllium and calcium belong to the same group of periodic table as magnesium. All of them have similar electronic configurations with 2 valence electrons each. Question 10 Name: a. Three elements that have a single electron in their outermost shell. Two elements that have two electrons in their outermost shell. Three elements with filled outermost shell. Solution: a. Three elements that have a single electron in their outermost shell are: 1.
Lithium 2. Sodium 3. Potassium b. Two elements that have two electrons in their outermost shell are: 1. Magnesium 2. Calcium c. Three elements with filled outermost shell are: 1. Argon 2. Helium 3. Question 11 a. Lithium, sodium, potassium are metals that react with water to liberate hydrogen.
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common Solution: a. These elements are alkali metals and they have 1 valence electron in their outermost shell and are therefore very unstable and reactive.
These elements each have full outermost subshell, which results in high stability. They only react with other elements in extreme circumstances, the trait for which they are named. Question 12 In the Modern periodic table, which are the metals among the first ten elements?
Solution: The metals are Lithium and Beryllium. Question 13 By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic characteristic?
Question 14 Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?
Question 15 Element X forms a chloride with the formula XCl 2 , which is a solid with a high melting point.
X would most likely be in the same group of the periodic table as a. Si Solution: b. Question 16 Which element has? Two shells, both of which are completely filled with electrons?
The electronic configuration of 2,8,2? A total of three shells, with four electrons in its valence shell? A total of two shells, with three electrons in its valence shell? Twice as many electrons in its second shell, as in its first shell? Neon 2,8 b. Magnesium 2,8,2 c. Silicon 2,8,4 d. Boron 2,3 e. Carbon 2,4. Question 17 What property do all elements in the same column of the periodic table as fluorine have in common? Solution: These elements all have 7 electrons in their outermost shells and these often exist as salts, combined with elements from the Alkali metal group.
Question 18 An atom has electronic configuration 2,8,7. What is the atomic number of this element? Question 19 Which type of ion, cation or anion, will be formed by element A? Anion will be formed by element A. Question 20 Nitrogen atomic number 7 and phosphorus atomic number 15 belong to group 15 of the periodic Table. Solution: Electronic configuration � Nitrogen � 2s 2 2p 3 and Phosphorus � 1s 2 2s 2 2p 6 3s 2 3p 3.
Nitrogen will be more electronegative; this is because its atom has small size due to which the attraction of its nucleus for the incoming electron is more. Question 21 How does the electronic configuration of an atom relate to its position in the Modern periodic table?
Solution: The electronic configuration of an atom increases in the outermost valence shell which relates to its position in the Modern periodic table. Question 22 In the Modern periodic table, calcium atomic number 20 is surrounded by elements with atomic numbers 12, 19, 21 and Solution: The atomic number of calcium is 20, so its electronic configuration is 2, 8, 8, 2. Thus, calcium has 2 valence electrons in its outermost shell. Now, the element which has 2 valence electrons, will have physical and chemical properties resembling to that of calcium.
The electronic configuration of element having atomic number 12 is 2, 8, 2. It has 2 valence electrons just like calcium. So, the element having atomic number 12 will have physical and chemical properties resembling that of calcium. Question 23 Where do you think should hydrogen be placed in the Modern periodic table? Solution: Hydrogen element has been placed at the top of group 1, above the alkali metals because the electronic configuration of hydrogen is similar to those of alkali metals.
Question 1. Which of the following is the outermost shell for elements of 2nd period? Because in period 2, there are two shell, K and L. Question 2. An element which is an essential constituent of all organic compounds belongs to [NCERT Exemplar] a group 1 b group 14 c group 15 d group 16 Answer: b Constituent of all organic compounds is carbon.
It belongs to group Question 3. Which one of the following elements exhibit maximum number of valence electrons? Therefore, P has maximum number of valence electrons, i. Question 4. Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Since, 2nd period has elements having atomic number 3 to Question 5. Which pair of elements belong to the same group? Elements which differ in atomic number by 8, i. Question 6. Which one of the following elements found a place in the periodic table later?
Question 7. Which of the following are the characteristics of isotopes of an element? Question 8. Which of the following elements would lose an electron easily? But out of K and Na, K will lose electron more easily because the force of, attraction on valence electron of K is least among the given elements.
Question 9. These solutions by Chemistry experts will help you to study the different types of elements, chemical reactions and more.
If you have any doubts while studying, you can ask your doubt on the TopperLearning portal. An academic expert will respond to your query within 24 hours.
Enter the OTP sent to your number Change. Resend OTP. Don't miss this! Ok Cancel. Ok Choose Chapter. Ok Choose Topic. Yes No. Choose Subjects. Choose Chapters. Have an account?
|
Build Your Own Duck Boat Number Cbse Class 10 Mathematics Algebra - I Was |
18.01.2021 at 12:51:52 Classes as Modified Table: In the frequency distribution table true American original custom-built all-aluminum boat trailer.
18.01.2021 at 11:40:20 Cover and the wide wobble will have.