1.

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 : (i) The number of electrons in their atoms (ii) The sizes of their atoms (iii) Their metallic characters (iv) Their tendencies to lose electrons (v) The formula of their oxides (vi) The formula of their chlorides

Answer»
Sr. No.PropertyPo
(i)No. of electrons in the atom3
11
19		4
12
20
(any one pair)
(ii)Size of the atomBiggerSmaller
(iii)Metallic characterMore metallicLess metallic
(iv)Tendency to lose electronsMoreMore
(v)Formula of oxidesP2OQO
(vi)Formula of chloridesPCIQCl2

Note: For parts (v) and (vi) examples using symbols of elements may also be accepted.

Detailed Answer:

(i) P has 1 valence electron, Q has 2 valence electrons.

(ii) 'P' is bigger than 'Q'.

(iii) 'P' is more metallic than 'Q'.

(iv) 'P' has more tendency to lose electrons than 'Q'.

(v) P2O and QO are formulae of their oxides.

(vi) P Cl and Q Cl2 are formulae of their chlorides.


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