Question

E. ANSWER THE FOLLOWING QUESTIONS :
1. What substance is mad
a substance is made of only one kind of atoms ?
2. Name two gaseous elements.
en two or more elements combine in a fixed ratio then what is the resultant product called
name the scientist who introduced the modern system of naming elements.
5. Name one tetraatomic molecule.
6. Define atomicity.
7. What do you understand by chemical formula of an element ?
8. What is the difference between 20 and Oz?
9. What is a radical ?
10. Differentiate between a cation and an anion.
11. Siate main postulates of Dalton's atomic theory.
12. Explain the modern system of naming elements by their symbols introduced by Berzelius.
13. What is variable valency ? Explain giving examples.​

Answer 1

Answer:

you can get it on the Google

Answer 2

Answer:

pure substance cation contains positive charge and anion contain negative charge