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PASSAGE - 3 : In modern periodic table t...

PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases.
Whic pair of elements have positive electron affinity values

A

Be,Mg

B

N,P

C

Ca,Sr

D

Ne,Ar

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The correct Answer is:
A
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