Question

Nonmetals in the third period. Write the names from the description

Answer 1

In Periodic Table, Total numbers of non-metals are in 3rd period is Four

[ Phosphorus , Sulfur , Chlorine , Iron  ]


Phosphorous ⇒

Phosphorus is represented by the symbol P.
The atomic number of phosphorus ⇒ 15 ,  Atomic mass ⇒ 31 .
Due to it's highly reactive nature, It Never found in a free state on the earth. 
It is not soluble in water but soluble in disulfide.
There are two major types of Phosphorus  White & Red
White phosphorus is highly toxic to human while red phosphorus is very less toxic 


Sulfur ⇒ 

Sulfur is represented by the symbol of S
The atomic number of sulfur ⇒ 15 , atomic mass ⇒ 32.
Found under normal condition.(Abundant)
Sulfur is used as a pesticides.
It is present in food also.
Reacts with metals expect gold.



Chlorine ⇒

Chlorine is represented by the symbol Cl 
The atomic number of chlorine ⇒ 17 , Atomic mass ⇒ 35
Chemically reactive non-metal.
Easily found on the earth (Abundant)
Chlorine gas also present in human body too.


Argon ⇒

Argon is represented by the symbol of Ar.
The atomic number of Argon ⇒18 , Atomic mass = 40
Easily found on earth (abundant) .
Obtained from the air.
Used in Light bulb, welding , Lasers etc.



Hope it Helps :-) 

Answer 2

Answer:
Phosphorus, sulphur, chlorine & argon
Explanation:
If you see modern periodic table this all are come under p-block & are in third period