Two elements 'A' and 'B' belong to the 3rd period of Modern periodic table and are in group 2 and 13 respectively.

Monjur Alahi

Two elements 'A' and 'B' belong to the 3rd period of Modern periodic table and are in group 2 and 13 respectively. Compare their following characteristics in tabular form :
(a) Number of electrons in their atoms
(b) Size of their atoms
(c) Their tendencies to lose electrons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides


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Salim Ahmed Kawsar

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( a) no. Of electrons in atom of "A " will be only 12 as they are in third period and must have 3 shells and no. Of electrons in last shall will be 2 as group no. Is 2

No. Of electrons in atom 'B' will be 13

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Salim Ahmed Kawsar

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Sr. No. Characteristics A B
(i) Number of electrons in their atoms 4 or 12or 20 5 or13 or 21
(ii) Size of their atoms Bigger Smaller
(iii) Their tendencies to lose electrons More Less
(iv) The formula of their oxides AO B2O3
(v) Their metallic character More metallic Less metallic
(vi) The formula of their chlorides ACl2 BCl3

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