Question

What would be the tendency to gain electrons change on moving from left to right in a period of the periodic table

Answer 1

it becomes more negative on moving from left to right.bcz as we move from left to right the atomic size decreases and nuclear charge increases.Both these factors tend to increase the attraction by nucleus for incoming electron and hence electron gain enthalpy becomes more negative from left to right

Answer 2

the tendency to gain electrons increases while we move left to right in the period because the effective nuclear charge also increases.is the effective nuclear charge increases the strength with which the atom can pull the electron towards itself also increases hence the property to donate electron decreasesin other words we can say electronegativity or non metallic character increases while moving left to right in a period hope the answer helps you