MODERN ORDER
Based on electronic structure.
Elements within the same group have similar properties - same amount of electrons in outer shell.
Larger atoms lose electrons more freely, and gain them less freely - due to the electrons in question being further away from the nucleus.
Group 1 - reactivity increases further down the group;the single electron in the outer shell is less attrcted due to the amount of space between electron and nucleus. The atom is lost more freely.
Group 7 - reactivity decreases further down the group; the electron needed to complete the outer shell is less easily attracted due to the weaker attraction.
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