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.2 Li(3) Be(4) 3 N a(11) Mg(12) 4 K(19) Ca(20) 5 Rb(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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i)electronic configuration of Ca-(2,8,8,2)
ii)the valence electron no. is 3.
iii)the no. of shells in Sr is 6.
iv)it is a metal.
v)Rb has the largest atomic size.
vi)Be, Mg, Ca and Rb
ii)the valence electron no. is 3.
iii)the no. of shells in Sr is 6.
iv)it is a metal.
v)Rb has the largest atomic size.
vi)Be, Mg, Ca and Rb
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