SUBHASH PUBLICATION|Exercise VALUE BASED QUESTIONS|8 Videos
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Mendeleev left some gaps in his periodic table.
What were the criteria used by Mendeleev's in creating his Periodic Table ?
Give any two features of Mendeleev's periodic table.
In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later ?
Which element was not known when Mendeleev framed the periodic table?
How were transition elements placed in 0 Mendeleev's Periodic Table and (ii) Modern Periodic Table?
Properties of the elements are given below. Where would you locate the following elements in the periodic table? a] A soft metal stored under kerosene. b] An element with variable (more than one) valency stored under water. c] An element which is tetravalent and forms the basis of organic chemistry d] An element which is an inert gas with atomic number 2. e] An element whose thin oxide layer is used to make other elements corrosion resistant by the process of "anodising".
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. a] Name the elements which have taken the place of these elements. b] Mention the group and the period of these elements in the Modern Periodic Table. c] Classify these elements as metals, non-metals, or metalloids. d] How many valence electrons are present in each?
SUBHASH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-VALUE BASED QUESTION
