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Which statement describes the general trends in electronegativity and first ionization energy as the elements in Period 3 are considered in order from Na to Cl?
(1) Electronegativity increases, and first ionization energy decreases.

(2) Electronegativity decreases, and first ionization energy decreases.

(3) Electronegativity and first ionization energy both increase.

(4) Electronegativity and first ionization energy both decrease.

Respuesta :

(3) Electronegativity and first ionization energy both increase describes the general trends in electronegativity and first ionization energy as the elements in Period 3 are considered in order from Na to Cl.
PBCHEM
Correct Answer: (3) Electronegativity and first ionization energy both increase.

Reason:
Electronegativity and ionization energy are dependent on effective nuclear charge and size of atom.

As we move along the periodic table from left to right, atomic size decreases and effective nuclear charge increases. The increase in effective nuclear charge and decrease in atomic radii favor ionization energy and electronegativity. 

Hence, in 3rd period (from Na to Cl) electonegativity and 1st ionization energy increases. 

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