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

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 their atoms
(c) Their metallic characters
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(J) The formula of their chlorides.

Accepted Answer

Characteristics
Group $1$ (element P) Group $2$ (element Q)

The number of electrons in their atoms The outermost valence shell contains one electron. The outermost valence shell contains two electrons.

Characteristics
Group $1$ (element P) Group $2$ (element Q)

The sizes of their atoms The atom of element P is larger in comparison to atom of element Q. The atom of an element Q is smaller in comparison to atom of element P. This is because as we move from left to right of the periodic table atomic size decreases.

Characteristics
Group $1$ (element P) Group $2$ (element Q)

Their metallic characters The metallic character is more compared to element Q. The metallic character is less compared to the element P. This is because as we move from left to right of the periodic table metallic property decreases.

Characteristics
Group $1$ (element P) Group $2$ (element Q)

Their tendencies to lose electrons The tendency to a loose electron is more and it can lose one electron. The tendency to a loose electron is less compare to element Q and it can lose two-electrons.

Characteristics
Group $1$ (element P) Group $2$ (element Q)

The formula of their oxides It will form $P_{2} O$ type oxide. It will form $QO$ type oxide.

Characteristics
Group $1$ (element P) Group $2$ (element Q)

The formula of their chlorides These will form $PCl$ type chlorides. These will form ${QCl}_{2}$ type chlorides.

Important Questions on Periodic Classification of Elements

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