M4 The Periodic Table: Group 1 & 2 metals
Slide 28 of 42
 Alkali metals Trends in Reactivity
Going           Down Group 1

reactivity increases.
Li
Na
 K
M
O
R
E
R
E
A
C
T
 I
V
E
Reason:
1) – charged electron is further from
        the pull of the charged nucleus.
2)  more electrons SHIELD the
     outer electron from the pull
     of the + charged nucleus K.