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3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon. (a) Name the element which has taken the place of (i) eka-aluminium, and (ii) eka-silicon 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Consider the following elements: Ca, Cl, Na, I, Li, Ba, Sr, K, Br Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Which element has: (a) two shells, both of which are completely filled with electrons? (b) the electronic configuration 2, 8, 2? (c) a total of three shells, with four electrons in its valence shell? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Consider the following elements: Na, Ca, Al, K, Mg, Li (a) Which of these elements belong to the same period of the periodic table? (b) Which of these elements belong to the same group of the periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Can the following groups of elements be classified as Dobereiner’s triads? (a) Na, Si, Cl (b) Be, Mg, Ca Give reason for your answer. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong: Oxygen, Nitrogen, Carbon, Chlorine, Fluorine 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong: Calcium, Magnesium, Sodium, Beryllium 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. (a) Calculate the average atomic mass of elements X and Z. (b) How does the average atomic mass of elements X and Z compare with the at... 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh State modern periodic law. (b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table? (c) How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explai... 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh State Mendeleev’s periodic law. (b) What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Why do we classify elements? (b) What were the two criteria used by Mendeleev to classify the elements in his periodic table? (c) Why did Mendeleev leave some gaps in his periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh How do the properties of eka-aluminum element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer. (b) What names were given by Mendeleev to the then undiscovered elements 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh State the merits of Mendeleev’s classification of elements. (b) Describe two anomalies of Mendeleev’s periodic classification of elements. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed? (b) Explain why, the noble gases are placed in a separate group. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Did Dobereiner’s triads also exist in the columns of Newlands’ law of octaves? Explain your answer. (b) What were the limitations of Dobereiner’s classification of elements? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is Newlands’ law of octaves? Explain with an example. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh What is Debereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Name three elements that have a single electron in their outermost shells. (b) Name two elements that have two electrons in their outermost shells. (c) Name three elements with completely filled outermost shells. 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh On which side of the periodic table will you find metals? (b) On which side of the periodic table will you find non-metals? (c) What is the name of those elements which divide metals and non-metals in the periodic table? 3 years ago Jaiyush19 class 10 periodic classification elements lakhmir singh Page 4 / 5 Prev 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? Δ Home About Us Contact Us Privacy Policy Term of Use Copyright © 2020 Eanshub All Rights Reserved
