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Use Mendeléer's Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, SI, and Ba.
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 ?
(a) Which two criteria did Mendeleev use to classify the elements in his periodic Table? (b) State Mendeleev's periodic law. ( c) Why could no fixed position be given to hydrogen in Mendeleev's Periodic Table ? (d) How and why does the atomic size vary as you go (i) from left to right along a period (ii) down a group ?
(i) In Mendeleev's Periodic Table, the elements were arranged in the increasing order of atomic masses. However, cobalt with atomic mass of 58.93 a.m.u. was placed before nickel having an atomic mass of 58.71 a.m.u. Give reason for the same. (ii) Write the formula of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table : On the basis of the above table, answer the following questions : (i) Name the element which forms only covalent compounds. (ii) Name the element which is a metal with valency three. (iii) Name the element which is a non-metal with valency three. (iv) Out of B and C, whose atomic radius is bigger and why? (v) Write the common name for the family to which the elements D and F belong.
Locate the position in the periodic table of the following elements on the basis of their properties: a] An element is an inert gas with atomic number 10. b] An element is tetravalent and a basic element of organic chemistry c] A soft metal stored under kerosene that can be cut with knife.
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic charactcristics?
The position of three elements A, B and C in the periodic table are shown below : Give reasons to explain the following: (i) Element 'A' is a metal. (ii) Element 'B' has larger size than 'C'. (iii) Element 'C' has a valency - 3.
SUBHASH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-VALUE BASED QUESTION
