Two elements 'P' and 'Q' belong to the same ...

CBSE Class 10 Science 2015 Term II Outside Delhi Set 1

Question : 9 of 36

Marks: +1, -0

Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in Group-1 and Group-2 respectively. Compare their following characteristics in tabular form : (a) The number of electrons in their atoms

(b) The sizes of theiratoms

(d) Their tendencies to lose electrons

(e) The formula of their oxides

(f) The formula of their chlorides

Solution:

	Property	P	Q
a	No. of electrons in the atom	$3,11,19$	$4,12,20$
b	Size of atom	Bigger	Smaller
c	Metallic character	More metallic	Less metallic
d	Tendency to lose electrons	More	Less
e	Formula of oxide	$\mathrm{P}_2\mathrm{O}$	$\mathrm{QO}$
f	Formula of their chlorides	$\mathrm{PCl}$	$\mathrm{QCl}_2$

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