Class 9 - Chemistry - Atoms and Molecules - Atomicity of Elements (Worksheet)#class9Chemistry #eduvictors #cbse2020

Class 9 - Chemistry - Atoms and Molecules - Atomicity of Elements (Worksheet)

Molecules of an element are formed by the atoms of the same type. Molecules of some elements contain only one atom and molecules of some elements contain two or more atoms. The number of atoms constituting a molecule is known as its atomicity.

Question: Here given a list of elements, identify if it is a metal or non-metal, write its atomicity and its symbolic chemical formula.

1. Argon 2. Helium 3. Oxygen

4. Hydrogen 5. Nitrogen 6. Chlorine

7. Phosphorous 8.  Sulphur 9. Sodium

10. Iron 11. Aluminium 12. Copper

Answer:

SNo.	Name	Type	Atomicty	Formula
1.	Argon	Non-metal	1-Monoatomic	Ar
2.	Helium	Non-metal	1-Monoatomic	He
3.	Oxygen	Non-metal	2-Diatomic	O₂
4.	Hydrogen	Non-metal	2– Diatomic	H₂
5.	Nitrogen	Non-metal	2– Diatomic	H₂
6.	Chlorine	Non-metal	2– Diatomic	Cl₂
7.	Phosphorus	Non-metal	4– Polyatomic	P₄
8.	Sulphur	Non-metal	8– Polyatomic	S₈
9.	Sodium	Metal	1– Monoatomic	Na
10.	Iron	Metal	1– Monoatomic	Fe
11.	Aluminium	Metal	1– Monoatomic	Al
12.	Copper	Metal	1– Monoatomic	Cu

👉See Also:

How to learn naming Chemical Formula
Ch 3 - Atoms and Molecules
Ch 3 - Atoms and Molecules (Worksheet)
Ch3 - Atoms and Molecules (MCQs)  
Ch 3 - Atoms, Molecules and Ions (Study Points)
Ch 3 - Atoms and Molecules (MCQs-2)

All about Names of the Chemical Elements