# How many of valence electrons do the elements in column 4 have? Are these elements very reactive?

$4$- assuming that you are talking about the fourth representative group or group $14$ of the periodic table.
Elements in group $14$ have $4$ valence electrons. Meaning that to achieve a stable octet they need to either gain or lose $4$ electrons in total. That would take significantly more energy than other elements, e.g., group $1$ (alkaline metals) or group $17$ (halogens.)