Question

What is meant by periodic early in the properties of elements with reference to the periodic table why are all elements of the group have similar properties how will the tendency to gain electrons change as we go from left to right across a period why?

Answer 1

Moving down in a group, the electronegativity decreases due to the longer distance between the nucleus and the valence electron shell, thereby decreasing the attraction, making the atom have less of an attraction forelectrons or protons.