Two elements -A- amp- -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 -s in- -8203-a- Number of electrons in their atoms-b- nbsp- size of their atoms-c- their tendencies to lose elec trons nbsp-d- The formula of their oxides-e- Their metallic character-f- The formula of their chlorides

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Two elements 'A' & '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 :s in
(a) Number of electrons in their atoms
(b) size of their atoms
(c) their tendencies to lose elec trons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides

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Solution

A B

Number of electrons 12 13

Size of their atoms bigger smaller

Their tendencies to lose electrons high low

Formula of oxides MO M₂O₃

Metallic character high low

Formula of their chlorides MCl₂ MCl₃

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Question 33
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

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	A	B
Number of electrons	12	13
Size of their atoms	bigger	smaller
Their tendencies to lose electrons	high	low
Formula of oxides	MO	M₂O₃
Metallic character	high	low
Formula of their chlorides	MCl₂	MCl₃

A B Number of electrons 12 13 Size of their atoms bigger smaller Their tendencies to lose electrons high low Formula of oxides MO M2O3 Metallic character high low Formula of their chlorides MCl2 MCl3

A B

Number of electrons 12 13

Size of their atoms bigger smaller

Their tendencies to lose electrons high low

Formula of oxides MO M₂O₃

Metallic character high low

Formula of their chlorides MCl₂ MCl₃