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The position of eight elements in the modern periodic table is given below where atomic numbers of elements are given in the parenthesis.Period No.2Li(3)Be(4)3Na(11)Ms(12)4K(19)Ca(20)5Rb(37)Sr(38)(i) Write the electronic configuration of Ca.(ii) Predict the number of valence electrons in Rb.(iii) What is the number of shells in Sr ?(iv) Predict whether K is a metal or a non-metal.(v) Which one of these elements has the largest atom in size ?(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms. |
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Answer» (i) Ca = 2,8,8,2 (ii) Valence electrons in Rb = 1 (iii) Five (iv) Metal (v) Rb is biggest in size (vi) Be < Mg < Ca < Rb. |
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