Name: Periods in the Modern Periodic Table
Uploaded: 2019-07-19
Duration: 5 min 31 s
Description: The general characteristics of periods are identified by its total number of shells in an atom or period number. The electronic configuration of an element d...

Question

The following table shows the position of six elements A, B, C, D, E and F in the periodic table:

Groups/Periods	1	2	3 to 12	13	14	15	16	17	18
2	A					B			C
3		D			E				F

Using the above table to answer the following questions :

(a) Which element will form only covalent compounds?
(b) Which element is a metal with valency 2?
(c) Which element is a non-metal with valency of 3?
(d) Out of D and E, which one has a bigger atomic radius and why?
(e) Write a common name for the family of elements C and F.

Accepted Answer

a. The element E will form only covalent compounds because it belongs to group 14 means its valency is four. Hence, it will share its electrons to form a covalent bond.

b. The element D is a metal with valency two because it belongs to group 2 means its outer shell contains two electrons. Hence, its valency is two.

c. The element B is a non-metal having valency three because it belongs to group 15 and its outer shell contains five electrons. Hence, its valency is three.

d. The element D has a larger radius than E because as we move from left to right of the periodic table, the atomic radius decreases.

e. The common name for the family of elements C and F is noble gases. They are group 18 elements. These elements are chemically inert and do not take part in any reaction.

Important Questions on Periodic Classification Of Elements

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