Question

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:
(i) Number of electrons in their atoms
(ii) Size of their atoms
(iii) Their tendencies to lose electrons
(iv) The formula of their oxides
(v) Their metallic character
(vi) The formula of their chloride









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Answer 1

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Characteristics A B

a). Number of electrons in their atoms 4 or 12 or 20 5 or 13 or 21

b). Size of their atoms Bigger Smaller

c). Their tendencies to los electrons More Less

d). The formula of their oxides AO B

2

O

3

d). Their metallic caracter More metallic Less metallic

f). The formula of their chlorides ACl

2

BCl

3