![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgnYv5-vKiNVV_Z6oLuHvLTQ8xiCx4Zl1yrJoiy6P9x0YC-OjBjiS7HVAWsOz88aGMI0ov1EGike-MJKeGQPq72s6tUyfFIuNkqa85oz4dyZo3oW9ycudTWznM4zycKpGujYvJ0-djxC84/s320/MwaterAnim.gif)
Reactivity of Group 1 increases when go down the group.
WHY?
- When an alkali metal atom reacts, it loses an electron to form a singly positively charged ion which is a stable noble gases electron arrangement.
- When go down the group, the atomic radius gets bigger due to an extra filled electron shell and the outer electron is further and further away from the nucleus.
- Therefore the outer electron is less strongly held by the positive nucleus as the attractive force is decreased.
- As a result, the outer electron is more easily lost and react more vigorously.
Reaction of Group 1 with water
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