Question

An element X has atomic number 19. (a) Write its electronic configuration. (b) To which group of the Modern
Periodic Table does it belong? (c) State the nature of the compound formed by element X with chlorine. (d) Write
the valency of element X.

Answer 1

Here x equals to potassium
a)electronic configuration:- 4s1
b)It belongs to period 4 of Modern periodic table, and it's valency is 1,-1
c)when potassium burns with oxygen and it liberated hydrogen and , the resulting alkaline solution turns red litmus to blue which means it's a base.


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Answer 2

GiVeN:-

An element X has atomic number 19

To fiNd :-

a) Electronic Configuration

We know that,

Atomic no = No of Electrons

So,

Electronic Configuration =

=> K = 2 , L = 8 , M = 8 , N = 1

b) Element with number of valence electrons are placed in the that no of group.

So, Group of the givem element is 1

c) Reaction with chlorine :-

When element X react with chlor4ine then ,

=> K + Cl ==> KCl

When potassium reacts with chlorine to form potassium chloride, there is a transfer of electrons that creates two charged ions, forming an ionic bond.

Nature of this compound is neutral.

d) Valency of element X = -1