Question

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s» Why shielding effect remains constant in any given period
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Answer 1

Answer:

Across a period, effective nuclear charge increases as electron shielding remains constant. This pulls the electron cloud closer to the nucleus, strengthening the nuclear attraction to the outer-most electron, and is more difficult to remove (requires more energy).

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Answer 2

$Across \:  a \: period, \: \: effective  \: nuclear \\ charge \:  increases \: as \: electron  \: shielding \\ remains \: constant. \: This \: pulls \:  the  \: electron \\ cloud \: closer \: to  \: the \:  nucleus, \: strengthening \\  the  \: nuclear \: attraction \: to \:  the  \\ outer-most \: electron, \: and \:  is  \: \\ more \: difficult \: to \: remove$