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I learnt that valence electrons are electrons present in the highest energy level. Question 1:Is that...

I learnt that valence electrons are electrons present in the highest energy level.

Question 1:Is that true ?

Question 2: But do we consider the electrons in the d orbitals?

Question 3: does the electrons in 3d sublehave a higher energy level than the electrons in the 4s sublevel ?

Question 4:what is the number of valence electrons present in --> [Ar] 4s: (^^) 3d: (^^)( ^)( ^ )( ^ ) ^ - represents an electron , () - an orbital

and why ?

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