# With the increase in atomic number in a period

$\begin{array}{1 1}\text{chemical reactivity increases}\\\text{electropositive character increases}\\\text{electronegative character increases}\\\text{electron affinity decreases}\end{array}$

The electronegativity is the tendency of an atom or a functional group to attract electrons (or electron density) towards itself.
With the increase in atomic number in a period,the electronegative character of elements increases
edited Feb 20