Select the correct statement(s) about periodic trends.

AThe ionic radius of $K X^{+}$ is smaller than that of $Cl X^{-}$ , although both have 18 electrons.
BNon-metallic character increases from left to right across a period.
CMetallic character increases from Li to Cs down group 1.
DElectronegativity (Pauling) follows F $<$ Cl $<$ Br.

Answer: A, B, C

K X^{+}

has the higher nuclear charge, so it is smaller than

Cl X^{-}

. B: effective nuclear charge increases across a period, so non-metallic character rises. C: metallic character increases down a group, so C is true. D is false: Pauling values are F 4.0, Cl 3.0, Br 2.8, so the order is reversed.

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Select the correct statement(s) about periodic trends.

Answer: A, B, C

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