Question

An element contains 9 electrons and 10 neutrons. Find its (i)Mass number (ii)Electronic configuration (iii)Valence shell (iv)Valency

Answer 1

Answer:

Q1.   Compare the properties of electrons, protons and neutrons.

Ans.



Answer 2

Answer:

1. 9+10=19
2. 2,7
3. 7
4. -1

Explanation:

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