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(D) Electronegativity generally increases as we move up a group in the periodic table due to a decrease in atomic size and an increase in effective nu

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$Be$

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(D) Electronegativity generally increases as we move up a group in the periodic table due to a decrease in atomic size and an increase in effective nuclear charge. All the given elements ($Be$,$Mg$,$Ca$,$Sr$) belong to Group $2$ (Alkaline Earth Metals). The order of elements from top to bottom in Group $2$ is $Be$,$Mg$,$Ca$,$Sr$. Since $Be$ is at the top of this group,it has the smallest atomic size and the highest electronegativity among the given options.

Which of the following elements has the highest electronegativity?

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