an atom of an element X may be represented as,electronic configuration-2,8,2,8 . i) what is the atomic no. of the element ? ii) what is the no. of neutrons in atom X ?iii) write the name and electronic configuration of the element. iv) state whether the element is a metal or a non- metal? v) what type of ion will be formed by atom X and why?
Answers
calcium
2,8,2,8 doesn't exist, it must be 2,8,8,2. This is calcium
Atomic no. 20 mass no. 40. No.of neutrons 20. And it is a metal. Since Valence shell has two electrons it is group 2 and therefore forms +2 ions
Solution :
Correction : The electronic configuration is 2 , 8 , 8 , 2
What is the atomic no. of the element ?
We have Provided an atom of an element x and the electronic configuration of the element is 2 , 8 , 8 , 2
It Implies ,
We have 2 in K Shell
8 in L Shell
8 in M Shell
2 in N Shell
Now , Add all this for obtaining the atomic number
⇒ 2+ 8 + 8 + 2
⇒ 20 atomic number
What is the no. of neutrons in atom X ?
Atomic Mass - Neutron = Proton
⇒ Neutron = 40 - 20
⇒ Neutron = 20
There are 20 neutrons in atom X
Write the name and electronic configuration of the element.
The name of an element is Calcium and the Electronic configuration of an element is 2 , 8 , 8 , 2
In these , We have 2 in K Shell
8 in L Shell
8 in M Shell
2 in N Shell
State whether the element is a metal or a non- metal?
The element Calcium is a metal as it has Characteristics of a metal
What type of ion will be formed by atom X and why?
The Valence Shell or Outermost Shell have two electron in an element therefore it belongs to Second Group of Modern Periodic Table and it forms +2 ions . Therefore the element is Cation means it gives Positive ions .