Question

1. The mass of an element is 20. It contains 10 electrons.

a)What is the number of protons and neutrons in it.

b) Identify the element and its valency.

c) State the problem of atomic structure which was solved after the discovery of neutrons​

Answer 1

Answer:

a. proton=10

neutron =10

b ) neon

valency = 0

c) due to inert gas it cannot be find till the discovery of other elements

Explanation:

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