They have the same number of occupied energy levels
they all have the same amount of outer shells for the atom
They are the same
Elements in the same family (group) on the periodic table have the same number of valence electrons and hence they have similar properties and reactivities.
Elements in the same group of the periodic table have similar chemical properties due to having the same number of valence electrons. This leads to similar reactivity and bonding behavior within a group of elements.
They change with atomic number.
Elements are organised in terms of properties in same column. Properties are found to be periodic .
They are the same
They have the same Valency
they have the same number of outer electrons
Their valence electrons are in the same energy level.
they all have the same electrons.
number of valence electrons
Elements in a given group have the same number of valence electrons and hence they have similar properties.
Elements in the same family (group) on the periodic table have the same number of valence electrons and hence they have similar properties and reactivities.
Elements in a given column have the same number of valence electrons and hence the similar properties.
NOTHIN !
They all have the same number of core electrons
they all have the same number of core electrons