Answer :

a) A and C.

Since the element has one electron in a 4s subshell so from this we can find that this element of 4 periods and 1 group.


In d-block elements, the group number will be equal to the sum of total electrons of s subshell and the electrons in preceding d subshell. So A and C are the elements which have one electron in 4s subshell.


b) E


When we go from up to down in a group then a number of shells increases so the radius is also increased. Therefore, the element with the smallest radius in s block is E.


c) D and C


d-block elements (transition elements) form coloured compounds due to the presence of transition element ions. So, element D and C will form coloured compounds.


d) A


Since A is in the bottom in group 1 and the size of A is greater than the other metals due to increment in shells. So, A will loss his 1 electron more easily than other metals and will make compound easily.


e) F


Noble gases are less reactive due to full filled octet. So, F is less reactive.


f) H, Atomic number = 35


If we compare this periodic table ‘s part to the modern periodic table then H is Br which has atomic number 35 and so electronic configuration will be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. We can also calculate atomic number by count the elements 2+8+8+17=35.


g)


(i) The lightest metal in s-block?


(ii) The second lightest metal in s-block?


(iii) Which metal is important for strong bones?


(iv) Which transition element ‘s chloride is blue in the dry state?


(v) Which is the most reactive element in the periodic table?


(vi) Which noble gas is used in welding along with Helium?


(vii) Which element in halogen family is used for unsaturation test?


(viii) Which element is used with zinc to make brass alloy?


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A part of tKerala Board Chemistry Part I