Question

$\boxed{blue}{\green{QUESTION}}$

$\colorbox{blue}{\green{How\:find\: the\: groups\: and \:periods \:of\: an\: Element}}$​​

Answer 1

$answer$

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.