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Consider four atoms from the second period: lithium, beryllium boron carbon and nitrogen which of these element has the lowest electronegativity value?

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lithium has the lowest. if fluorine is the highest then lithium is the lowest. i hope this helps you out!
Dejanras

Answer is: lithium.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

Electronegativity increases from left to right across a period.  

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.

For example nitrogen has electronegativity approximately χ = 3 and lithium has χ = 1, so if they form bond, nitrogen will have negative and lithium positive charge.

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