Q39 of 52 Page 43

Arrange the following elements in the increasing order of their metallic character Mg, Ca, K, Ge, Ga

Ge < Ga < Mg < Ca < K


The metallic character decreases from left to right in a period. All the above elements, except Mg, are placed in the same period so the metallic character will decrease from K to Ge and order of metallic character would be Ge < Ga < Ca < K


As we move down in a group, metallic nature of elements increases. So, Ca is more metallic than Mg. Similarly, Mg will be less metallic than K because in period, metallic nature decreases from left to right. Hence the increasing order of metallic character would be


Ge < Ga < Mg < Ca < K


The arrangement of some of these elements in the Modern Periodic table is shown as below.



More from this chapter

All 52 →
37

Identify and name the metals out of the following elements whose electronic configurations are given below.

(a) 2, 8, 2


(b) 2, 8, 1


(c) 2, 8, 7


(d) 2, 1

 38

Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?

 40

Identify the elements with the following property and arrange them in increasing order of their reactivity.

(a) An element which is a soft and reactive metal.


(b) The metal which is an important constituent of limestone.


(c) The metal which exists in liquid state at room temperature.

 41

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

(a) A soft metal stored under kerosene.


(b) An element with variable (more than one) valency stored under water.


(c) An element which is tetravalent and forms the basis of organic chemistry.


(d) An element which is an inert gas with atomic number 2.


(e) An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “anodising”.