This worksheet is a reduced periodic table – just the first three periods – which the students have to complete: They have to add atomic number, atomic weight and have to complete the electron distribution on the valence shell. I use it to clarify that...
a) elements are in a specific order (weight, number of electrons, periodic number)
b) number of electrons = atomic number,
c) number of valence electrons = group number
d) periodic number = number of shells
e) octet rule / reactivity of element groups (alkaline metals, halogens, noble gases)