In which elements the screening effect is not observed
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The electrons in the valence shell are attracted by the positively charged nucleus. ... Due to this, there is a decrease in the force of attraction between the electrons in the valence shell and the nucleus. This effect is known as the screening effect.
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Answer:He+1 , Li+2 , Be+3
The phenomenon which occurs when the nucleus reduces its force of attraction on the valence electrons due to presence of inner shell is called as screening or shielding effect.
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