The elements of period 2 of the periodic table (Li to Ne) show periodic trend in their properties
Give one similarity or one differnce between the elements or compounds and this
A : Similarity
B : Difference
Li to Ne elements lie in 2nd period so we know that when we go from left to right in periodic table then size decrease.
Li,Be are metals so they loose electrons while nitrogen, Oxygen are non-metal so they gain electron that is the difference.