Assertion: In a period left to right metallic character increases Reason : In a period left to right electronegativity decreases

The assertion is incorrect while the reason is correct.

In a period from left to right, the metallic character does not increase, it actually decreases. This is because, as we move from left to right across a period in the periodic table, the number of protons in the nucleus increases, which increases the nuclear charge. This increased nuclear charge attracts the electrons more strongly, thus decreasing the metallic character.

On the other hand, the reason is correct. As we move from left to right across a period, electronegativity does indeed increase, not decrease. This is due to the same reason - the increase in nuclear charge attracts the electrons more strongly, making the atoms more electronegative.

So, the assertion and reason are not correctly related.