__________ is the total attractive force exerted by protons present in the nucleus on electrons which are present in the outermost shell.

Nuclear charge

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Screening effect

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Effective nuclear charge

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Electromagnetic force

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Solution

The correct option is A Nuclear charge
The total attractive force exerted by protons in the nucleus on electrons in the valence shell is called nuclear charge.
The repulsive force between electrons on the valence shell and inner electrons is known as screening effect.
The net force felt by electrons in the outermost shell after the attractive force by protons and repulsive force by innermost electrons is called effective nuclear charge.

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