Q6 of 55 Page 1

An element ‘X’ has atomic number 13:

(a) Write its electron configuration.


(b) state the group to which ‘X ‘belongs?


(c) Is ‘X’ a metal or a non- metal?


(d) Write the formula of its bromide.

(a) Since the atomic number given = 13


The Electronic configuration of the element= 2, 8, 3


(b) Group number to which the element ‘X’ belongs = 10 +3 = 13th group.


(c)Since ‘X’ has 3 valence electrons. So, ‘x’ is a metal.


(d) The formula for the bromide can be calculate by cross multiplication of the valences which is as follows:



So, formula of its bromide is XBr3


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Explain the variation of the following properties of the element in the periodic table.

(i) Atomic radius in a period.


(ii) Metallic character in a period.


(iii) valency in a group.

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(b) Give one example of an evolutionary change produced is an organism for one purpose which later on becomes more useful for a different function.