1.

The chemical elements are arranged in the order of increasing electronegativities in the sequence

Answer»

P, Si, Se, Br, N
Si, Se, P, Br, N
Si, P, Se, Br, N
Se, P, Si, Br, N

Solution :Electronegativity increases as we move from left to right in a period so phosphours is more ELECTRONEGATIVE than silicon and bromine is more electronegative than selenium and electronegativity decreases as we descend the group.
`therefore` Nitrogen is the most electronegative ELEMENT of the given elements.
`therefore` The OBSERVED ORDER is Si, P, Se, Br, N.


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