question_answer

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 or their oxides

(e) Their metallic character

(f) The formula of their chlorides

 

Answer:

		A	B
(a)	Number of electrons in their atoms	4,12 & 20	5, 13 & 21
(b)	Size of their atoms	Bigger	Smaller
(c)	Their tendencies to lose electron	More	Less
(d)	The formula of their oxides	AO	\[{{B}_{2}}{{O}_{3}}\]
(e)	Their metallic character	More metallic	Less metallic
(f)	The formula of their chlorides	\[AC{{l}_{2}}\]	\[BC{{l}_{3}}\]