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Main points:

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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? Answer : b 2nd period contains elements with atomic number 3 Li , 7 N , 10 Ne. 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? Answer : d Isotopes of an element have same atomic number and show same chemical properties. 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. Which among the following elements has the largest atomic radii? Answer : c Atomic radius increases on moving down in a group. Na and K are in the same group and K is below Na, so K will have higher atomic radius, i. In a period on moving left to right, atomic radius decreases.

Since, K and Ca are in the same period and K is in 1st group and Ca is in 2nd group, so atomic radius of K will be more than Ca, i. Also Na and Mg are in the same period, but Na belongs to 1st group and Mg belongs to 2nd group, so atomic radius of Na is more than Mg, i. Hence, we can say that the atomic radius of K is largest.

Question : Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic table? Answer : c On moving from left to right, the atomic number increases and hence, the nude charge increases. With the increase of nuclear charge, the force binding the electron increases so the atom lose the electrons with more difficulty, not easily.

Which one of the following depicts the correct representation of atomic radius r of an atom? Answer : b Atomic radius is the distance between nucleus and outermost shell [consisting electron s ].

Hence ii and iii are the correct representations. Which of the following statement s about the modern periodic table are incorrect?

Answer : b Only statement iv is correct. All the elements in the modern periodic table are arranged on the basis of their increasing atomic number. All the isotopes can be placed at one place in the same group of the periodic table. The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

Answer : c Its outermost shell has 4 electrons. So, it is a non-metal. Non-metal forms acidic oxide and by sharing of electrons with halogen, it forms covalent halide. Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al. Answer : b Metals lie on the extreme left side of the periodic table. Metallic character decreases from left to right in a period. On moving in ai period from left to right, the metallic character decreases.

Which of the following set of elements is written in order of their increasing metallic character? Answer : a Metallic character increases as we go down in a group. Which one of the following does not increase while moving down the group of the periodic table? Answer : c Elements in each group has some number of valence electrons hence have same valency and thus exhibit similar chemical properties. The elements X, Y and Z are shown in a portion of periodic table.

What would be the representations of ionic forms of X and Z respectively? Answer : a X having 1 electron less than that of Y, which is a noble gas having complete octet , will tend to gain 1 electron while Z will tend to lose 1 electron to achieve complete octet configuration.

Answer : a Non-metals form acidic oxides in general. Non-metals have 4 to 8 electrons in the outermost shell. The electronic configuration of given elements are a i. Rest three elements with atomic- numbers, 3 Li , 12 Mg and 19 K are metals and hence, form basic oxides. Answer : c Gallium has a valency of 3.

Hence, it forms an oxide having molecular formula E 2 O 3. In other options, valency of E is not 3. The diagram given below shows the position of elements in a portion of the periodic table. Ionic compound is formed between ���. Answer : d being in group IIA is most electropositive among given elements while E being in group VIIA is most electronegative among the given elements.

Hence, both of these will form ionic compound, more readily than the other given elements. Element X forms a chloride with formula, XCl2, which is a solid with a high melting point. Answer : b The formula of chloride is XCl2, that means the valency of the element X is 2.

The element having valency 2 will be present in group 2. Out of the given choices magnesium Mg belongs to group 2. Mddle block 1 Identify the heavy metal which belongs to same group as the element discussed above. Answer : c The element discussed in diagram is carbon.

Carbon c and lead Pb both belong to group IVA. Arrange the elements, represented by alphabets p, q, r, s and t in the above shown outline of periodic table, in increasing order of their valency. The diagram given above represents outline of the periodic table.

The alphabets p, q, r, s and t represent elements. Which one of the following pairs of alphabets represents elements which consist of same number of shells in their atom? Answer : d Elements q and s belong to same period of the periodic table and hence, will have same number of shell. Answer : Merits i This classification worked well for lighter elements only up to Ca.

When noble gases were discovered, neon Ne between F and Na, and argon Ar between Cl and K, it becomes the ninth element and not the eighth which has the similar properties.

How many elements are there in-between X and Y? Answer : The law states there are eight elements in an octave row. No of elements between X and Y is six. Answer : The law recognised the relation between atomic weight of an element and its chemical properties for the first time.

Question : 4 Lithium, Sodium and potassium were put in the same group on the basis of their similar properties. Answer : i Li, Na and K are very reactive alkali metals, which react with water with the formation of an alkali and hydrogen gas. Question : 5 State two reasons for rejecting law of octaves. Answer : i The law did not extend properly beyond the element calcium. Question : 6 Name four alkaline earth metals.

To which group do they belong? Answer : The four alkaline earth metals are beryllium, magnesium, calcium and strontium. They belong to II A group. Question : 7 What is called diagonal relationship? Answer : The similarity in properties between certain elements of different periods placed diagonally to one another in a periodic table is called diagonal relationship.

Answer : It is defined as the amount of energy released in adding an extra electron to an isolated neutral gaseous atom in its lowest energy state, to convert it into gaseous ion. Electron affinity increases as one moves from left to right in periods or top to bottom in groups. Answer : The property of atoms to attract electrons in a covalent bond is called electronegativity.

Question : 10 a Name an alkali metal other than lithium, sodium and potassium. Question : 11 Explain why the following statements are not correct? Answer : i All groups do not contain both metals and non-metals. Group I and II contain only metals. This is because as the size of the atoms increases, the valence shell electrons can be easily removed.

This is because across the period, the size of the atom decreases and the valence shell electrons are held more tightly. In a group the atomic number increases as we move down.

Question : 12 Why are the elements sodium and chlorine in the same period of the Periodic table? Answer : This is because the atoms of both the elements have three shells containing the electrons.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Top Block 1. Mddle block 1. Identify the heavy metal which belongs to same group as the element discussed above.

Chapter 4 - Carbon and Its Compounds. Chapter 5 - Periodic Classification of Elements. Chapter 6 - Life Processes. Chapter 7 - Control and Coordination. Chapter 8 - How do Organisms Reproduce? Chapter 9 - Heredity and Evolution. Chapter 10 - Light Reflection and Refraction. Chapter 11 - Human Eye and Colourful World. Chapter 12 - Electricity. Chapter 13 - Magnetic Effects of Electric Current. Chapter 14 - Sources of Energy.

Chapter 15 - Our Environment. Chapter 16 - Management of Natural Resources. By referring to the 5 Science class 10 solutions available for NCERT, the students are able to avail a simpler procedure of learning. It consists of various to the point question and answers, followed by proper explanations of different subtopics.

This solution is what students can avail when they are trying to comprehend the basic concept behind this chapter. This primary knowledge will prove to be useful when a student moves on towards later years of their education. To understand chemistry as a subject, having a clear concept about elements on the periodic table is necessary.

In this segment of chapter 5 science Class 10, students will learn how elements were classified in the periodic table based on their properties. These elements were segregated from one another on the basis of whether they were gases, metals or non-metals. A German chemist, known to all as Johann Wolfgang Dobereiner, had attempted to group elements based on their properties.

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