3.1C Trends in Group 1 and Group 17

Elements with high metallic character have _________ __________ in their structure.

localized electrons

Elements with lower ionization energies are more likely to be ________

metallic

What are Alkali Metals and their relation to ionization energy

Group of elements with decreasing ionization energy and increasing metallic character going down the group.

Alkali Reactivity

Alkali metals become increasingly reactive going down the group as they have a greater tendency to lose their valence electron.

Tell me about the reactions of Alkali Metals with Water

Alkali metals can displace H2 gas from water, releasing energy and sometimes igniting the hydrogen gas.

Vigor of Reaction in relation to Alkali metals

The reaction of alkali metals with water becomes more vigorous going down the group due to the valence electrons being further from the nucleus and being lost more easily.

Reaction Equation

2 M(s) + 2H2O > 2 MOH (aq) + H2 (g)

Ionic Equation

2 M (s) + 2 H2O (l) > 2 M+ (aq) + 2 OH-(aq) + H2(g)

Why do alkali metals make basic solutions and what are they called?

Since hydroxide (OH-) ions are a product of the reaction, Alkali metals make alkaline solutions.

Halogens

Group 17 elements that can be described based on their non-metallic character, which is linked with electronegativity.

Tell em about Halogen Reactivity

Halogen reactivity decreases going down Group 17, with fluorine being the most reactive halogen.

As Electronegativity decreases…

the ability of a reactant to remove electrons from another reactant decreases.

2 KBr (aq) + Cl2 (aq) > ?

2 KCl (aq) + Br2 (aq)

2 KCl (aq) + I2 (aq) > ?

No reaction

2 KI (aq) + Br2 (aq) > ?

2 KBr (aq) + I2 (aq)