Question

What is valence shell??
What are the uses of periscope??



answer both... need relevant answers only​

Answer 1

answer:

• the outer most shell of an atom containing the valance electrons is known as valance shell.
• Periscope is used in submarines,nuclear reactor etc...

Answer 2

Answer:

valency : it is the combining capacity of an element.

periscope is used in submarines to see the objects on the surface of water, like ships and also used to see enemy movements, from trenches without any danger of being seen by them.

Explanation:

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