given below are the atomic radii and ionization energies of three elements X,Y andZ each having n electrons in the outermost shell of their atoms: element are X,Y atomic radius of X andY are 1.20 and 1.31. Ionization energy of X andY are 5.4 and 5.1. answer the following question (1) will the valencies of these elements be same or different (2) which element will have the highest atomic number
Answers
Given below are the melting point and the atomic radii of three elements X, Y & Z each having an electron in the valence shell of their atom:
Element X Y Z
M.P(
o
C) 1.54 1.96 1.34
ATOMIC
RADIUS(
A
o
) 1.31 1.36 1.20
a) Will the valencies of the elements be the same or different? Why?
b) Which element will have the highest atomic number? Why?
c) Arrange the element in decreasing order of their metallic character.
ANSWER
According to the atomic radius,
elements can be arranged as-
Y>X>Z
(a) Given the each element has an e
−
in the outermost shell. ∵ They have same number of e
−
in the outermost shell. ∴ , they belong to the same group.
(b) Element with highest atomic radii will have highest atomic no. i.e. Y.
(c) As we have inferred above the atomic radii is in the order Y>X>Z. So, metallic character order is also the same, i.e. Y>X>Z.