an element X belongs to 3rd period and second group of modern periodic table. write the electronic configuration. write the formula of the compound it forms with S. Write the formula of the compound X reacts with Y of electronic configuration 2,6.
Answers
Answer:
element x= Magnesium
atomic no. = 12
electronic configuration= 2,8,2
formula when react with s = MgS
element y= oxygen
formula when react with oxygen or y = MgO or xy
An element X belongs to 3rd period and second group of modern periodic table. write the electronic configuration. write the formula of the compound it forms with S. Write the formula of the compound X reacts with Y of electronic configuration 2,6.
Explanation:
Periodic table
It is a tabular arrangement of elements according to periodicity in properties of elements .
It consist of groups and periods and to each element group and period is assigned depending upon its valence electrons .
The element is placed in 3rd period and second group and is recognized as : Aluminium .
Its atomic number = 13
Its electronic configuration 2,8,3
Its valency : +3
It will combine with S to form its sulphide.
Sulphur has atomic number : 16
Electronic configuration : 2,8,6
Valence electrons : 6
Valency = -2 .
So, when they both combine they form sulphide with molecular formula : Al₂S₃.
When it reacts with other compound Y of configuration 2,6 it forms :
Al₂Y₃.
This is because again the element Y has a valency = -2 .